Update setup.py

Update setup.py

Update setup.py

Fixes:
* #102 : fix: retrieving history for a given identity only accepts strings, `None` was provided.

Merge pull request #101 from xethorn/xethorn/20-june-1.0.1

v1.0.1

Update setup.py

Merge pull request #98 from xethorn/xethorn/20-june-bump-version-1

Update setup.py

Bump to 0.4.1

Merge pull request #95 from xethorn/xethorn/20-may-issue-1.0.0a2

Issue 1.0.0 Alpha 2

Merge pull request #93 from xethorn/xethorn/20-may-create-alpha-release

Create 1.0.0 alpha release

Update setup.py

* Add support for custom worker identifiers (activity and deciders). 
* Add logging on deciders.