release pvlink 0.3.1

CHANGELOG.md

+# pvlink 0.3.1
+- bugfix: internal version number missmatch fixed
+- changed documentation for npm to point to readme on git
+
+
 # pvlink 0.3.0
 - added support for JupyterLab 2
 - internal structure changed and removed now unneded files

pvlink/_version.py

 # Module version
-version_info = (0, 3, 1, 'alpha', 0)
+version_info = (0, 3, 1, 'final', 0)
 
 # Module version stage suffix map
 _specifier_ = {'alpha': 'a', 'beta': 'b', 'candidate': 'rc', 'final': ''}