v0.6.0
    add support for DS2000
    add command-line utility wfmconvert
    improve support for DS1000Z
    fix DS4000
    add .csv export
    add .wav export
    
v0.4.1
    fix requirement for enum by just requiring python > 3.4
    
v0.4.0
    huge change.  Now using kaitai struct exclusively
    added support for 1000C, 4000, 6000 .wfm formats
    much more testing
    many api changes.
    
v0.3.0
    fix exception handling, support parsing URLs

v0.2.0
    improve README.md and long_description in setup.py

v0.1.3
    fix setup.py classifiers

v0.1.2
    fix URL and other infelicities

v0.1.1
    add missing files needed for release

v0.1.0
    initial commit
