Update changelog for v5.3.1
Update changelog for v5.3.1

- Change changelog format to follow style guide at
  http://keepachangelog.com/en/0.3.0/
- Update changelog for previous releases
- Add entry for v5.3.1

sociomantic/libdrizzle-redux,sociomantic/libdrizzle-redux,sociomantic/libdrizzle-redux