* v2.1.17
    + VAISALA CL31 & CL31 readers (swiss airport included)
        - add reading of vertical visibility variable accessible through `vertical_visibility` keyword
    + CAMPBELL SCIENTIFIC CS135 reader
        - add reading of vertical visibility variable accessible through `vertical_visibility` keyword
        - add reading of highest signal received variable accessible through `highest_signal_received` keyword

* v2.1.16
    + LUFFT CHM15k readers
        - correct calculation of RCS. Doesn't substract background anymore.

* v2.1.15
    + leosphere WLS readers
        - readers were not able to concatenate several input files. Only the last one was used.

* v2.1.14
    + leosphere WLS70 reader 10s
        - correct bug with `u`, `v`, `x_wind` and `y_wind`
        - same name was used for `u`, `x_wind` and `v`, `y_wind`

* v2.1.13
    + netCDF creation module
        - correct bug preventing creation of multidimensional time variables
        - it is now possible to create time_bnds variables require by CF convention when time dependant processing is done on variables
            + for this kind of variable is it still necessary to provide units (which make the file not fully CF compliant)
    + leosphere WLS reader
        - add calculation of u and v for each reader from wind_speed and wind_direction
        - update examples of configuration files
        - update tests to check with multiples version of raw data

* v2.1.12
    + leosphere WLS reader
        - WLS70 10 min reader correct bug with missing values for cnr_min, cnr_max, ws_min and ws_max

* v2.1.11
    + leosphere WLS reader
        - update variables read names for WLS70 10s to make them more readable

* v2.1.10
    + leosphere WLS reader
        - add reader for WLS7 1s data and WLS70 10s data
        - update examples of configuration files

* v2.1.9
    + netCDF creation module
        - correct bug when creating time variable and calendar attribute is missing
        - correct bug with string in netCDF3_CLASSIC format
    + add first version of sigmaspace MiniMPL reader
    + add first version of leosphere WLS7v2 and WLS70 reader (wind LIDAR)
        - examples of configuration files are not yet available
    + CHM15k reader
        - add possibility to add the path to the overlap TUB*.cfg file in the reader_conf section

* v2.1.8
    + chm15k reader
        - add test to check that cho (cloud base offset) is substracted from cbh if available
    + cl31 reader
        - correct bug with CBH and CLH. Instead of converting data in feet to meters, coefficient was applied to data in meters
        - add test to check the conversion of data is working
        - the bug was already corrected in reader for swiss airport data

* v2.1.7
    + create a reader specifically for CHM15k data from UK metoffice
    + correct errors in E-PROFILE configuration files examples

* v2.1.6
    + improve managing of time variable in the creation of netCDF file
        - a new type has been added: `$time$`
        - section about time variable are required to have `units` and `calendar` options (compatible with netCDF-CF convention)
        - update all configuration files examples with the new `$time$` type for time variables
    + chm15k reader
        - add variable `start_time`
    + cl31 reader
        - add variable `start_time`
        - an option `time_resolution` (in seconds) is now required in `[reader_conf]` section
    + update E-PROFILE example conf file with the requirements describe in `Raw2L1-L1L2-issues_and_developments` documents

* v2.1.5
    + add a new argument `-anc` which allows to give the reader another type of file
    + vaisala reader
        - correct bugs detected by MetOffice and add tests
        - change how instruments messages are printed. Instead of doing it for each time step a summary is done at the end of the reading
    + chm15k-nimbus reader
        - correct bugs detected by Metoffice and add tests
        - change how instruments messages are printed. Instead of doing it for each time step a summary is done at the end of the reading
        - it is now possible to give to pass the overlap using TUB*.cfg from lufft with -anc command line options. It allows a better checking of the size and could be used during the reading
    + RPG hatpro (experimental)
        - add reader for every type of files required by TOPROF

* V2.1.4
    + correct minor bug in test

* v2.1.3
    + correct minors bugs in vaisala reader
        - problem reading CBH when full obscuration is determine
        - problem reading files when message type change in a file
        - problem reading file when an error occure during conversion of hexadecimal string to integers

* v2.1.0
    + change logger message to make them compatible with eprofile
    + create conf file for eprofile. Compare to TOPROF version, only the global variable are changed
    + allow user to chose the value of missing value in the reader configuration file. It needs to be taken into account in the data reader
    + add options to check size and timeliness of input files and data
    + add possibility to give several input files or pattern as argument in the command line
    + a value from the reader can now be put in a netCDf attribute
    + correct the bug making it impossible to have a different level of logs in the console and in the file
    + correct minor bugs creating the logging of warnings
    + vaisala reader
        - add a modified version of the reader to process swiss airports files
        - add decoding of instrument message. They are printed in the log during processing in any found
        - if instruments is set in feets value in converted into meters automatically
        - check scale value. data without a scale of 100% will be logged
        - correct a bug making the the tilt angle a scalar value instead of a time depending variable
    + chm15k-nimbus
        - make the reader compatible with macehead data (They seem to have a really old version. Some variables are filled with missing values).
        - instruments messages/alerts available in the file are logged with their meaning
        - correct a bug concerning the reading of p_calc value
    + RPG hatpro (experimental)
        - add reader to convert data into TOPROF format. All HATPRO output files are not taken into account


* v2.0.7
    + add CHANGELOG, LICENSE, requirements.txt files
    + update README
    + add example input files into the repository
    + correct bug in case vaisala raw file contains newline caracter at the start of the line
    + first stable version after intensive testing during ceilinex campaign

* v2.0.6b
    + correct bug in campbell reader creating an infinite loop when the timestamp is not just the line after the first message

* v2.0.5b
    + add option to use compression with netCDF4 file format
    + correct bug in one lufft CHM15k test preventing it from being run
    + first test with CS135 to integrate string variables. Only works with netCDF4 files

* v2.0.4b
    + improve reader robustness of header reading for vaisala and cambell scientific readers

* v2.0.3b
    + add reader for Campbell Scientific CS135
    + correct problem with vaisala and campbell HEXA profile decoding


* v2.0.2b
    + correct problem when chosing a different log file than the default one
    + add TOPROF configuration files for lufft CHM15K-NIMBUS and vaisala CL31 and CL51
