Version 0.8.1

Version 0.8

Merge pull request locustio#654 from aldenpeterson-wf/version-bump

Bump version to 0.8a3 for another pre-release candidate

Bumped version

Version 0.7.5

Version 0.7.4

Version 0.7.3

Version 0.7.2

Updated changelog and bumped version

Updated changelog to reflect the requests 2.2 version upgrade