environment file to be used for changelog generation

release/changelog_environment.yml

+# run: conda env create --file environment.yml
+name: changelog
+dependencies:
+- python>=3.5
+- docopt
+- pip
+- pip:
+  - python-gitlab

release/generate_changelog.py

@@ -17,11 +17,9 @@ Options:
 
 """
 
-import os
 import sys
 from docopt import docopt
 import gitlab
-import distutils.version
 import datetime