v0.1.5

Merge branch 'release-0.1.5'

* release-0.1.5:
  Bump version: 0.1.4 → 0.1.5
  Add config for bumpversion utility, format changelog.
  Update installation instructions.

v0.1.4

Added: Citation instructions and release DOIs via GitHub/Zenodo.
Added: Changelog file

v0.1.3

Several compatibility and usability improvements:

• Added: Python3 compatibility (@speleo3).
• Fixed: Several bugs related to Tk interface (@speleo3).
• Improved: installation instructions to use Github master zip file by default.