Updates changelog for v0.8.6

* forgot a few minor updates

Updates vim doc for v0.8.5 release

Updates vim doc for v0.8.4 release

Centers the overall screenshot

Updated version to 0.8.2

Updated version tagging and changelog for v0.8.1 release

Updated version to reflect v0.8.0

Updated version and changelog to reflect v0.7.1

Updates vim doc for v0.7.0

Updated vim doc for v0.6.1