v2.7.7

Cthulhu v2.7.7

Diff since v2.7.6

Closed issues:

• UndefVarError: optimize not defined (#332)

Merged pull requests:

• Use literal instead of undefined optimize var (#334) (@simsurace)
• Warn color for small unions (#337) (@jishnub)
• release 2.7.7 (#338) (@aviatesk)