message: Finalizing CHANGELOG.md for release of v0.7.6.
diff: # Change Log
  This is the changelog for OutpostHD.
  -## [0.7.6] - UNRELEASED
  +## [0.7.6] - 2018-07-06
  -Maintenance release with some features polished.
  +Numerous bug fixes, rounding out some features introduced in v0.7.5 and introduces the new Mine Operations Window.
  ### Added
  - Added a Main Menu state which allows for starting a new game, continuing an old game or quitting (options menu slated for a future release).
  