Update utils.py

Fixed -2250
Fixed #2250
Add Release History to the sidebar

Closes #2269
Made more better
Merge pull request #2271 from mikecool1000/fix-2250

Fixed #2250
Merge pull request #2273 from sigmavirus24/add-changelog-to-sidebar

Add Release History to the sidebar
Merge pull request #1 from kennethreitz/master

Attempt at #1956