Features:

 - Add alpha channel support for png files in Script (#614)

Bug fixes (BUG):

 - Fix formatWarning for filename without slash (#612)
 - Add whitespace between words for extractText() (#569, #334)
 - "invalid escape sequence" SyntaxError (#522)
 - Avoid error when printing warning in pythonw (#486)
 - Stream operations can be List or Dict (#665)

Documentation (DOC):

 - Added Scripts/pdf-image-extractor.py
 - Documentation improvements (#550, #538, #324, #426, #394)

Tests and Test setup (TST):

 - Add Github Action which automatically run unit tests via pytest and
   static code analysis with Flake8 (#660)
 - Add several unit tests (#661, #663)
 - Add .coveragerc to create coverage reports

Developer Experience Improvements (DEV):

 - Pre commit: Developers can now `pre-commit install` to avoid tiny issues
               like trailing whitespaces

Miscallenious:

 - Add the LICENSE file to the distributed packages (#288)
 - Use setuptools instead of distutils (#599)
 - Improvements for the PyPI page (#644)
 - Python 3 changes (#504, #366)

You can see the full changelog at: 1.26.0...1.27.0