Pycaption

^^^^^
- Added language parameter to WebVTTWriter
- Fix for TranscriptWriter merging words at caption boundary
- Updated documentation with positioning information
- Updated DFXP reader to fallback to the document's language if no language is present on individual <div>
- Introduced PYCAPTION_DEFAULT_LANG environment variable and set it to default to 'und'
- Fixed DFXPReader timestamp validation to accept frames and frames conversion to microseconds

^^^^^
- Included tests in PyPI tarball
- Ignore WebVTT empty cues instead of raising an exception
- Updated BeautifulSoup version to >=4.8.1,<4.9 and fixed failing tests
- Handled index error when sending bad timestamp for DFXP format

^^^^^
- Fixed issue with SCC reader including both special characters and their potential substitute
- Modified enum34 dependency to versions under Python 3.4
- Removed Python 3.4 and added 3.6, 3.7 and 3.8 to Travis tests

^^^^^
- Fixed typos in SCC positioning codes
- Added missing SCC positioning codes to positioning map

^^^^^
- Added Python 3 support

0.5.x
^^^^^
- Added positioning support
- Created documentation