new features:
- cl: lambda: support in return statement (#1228)
- cl: config: add NoSkipConstant for disable optimization of skip constants
- cl: check SliceLit type (#1120)
- cl: loadVars check CompositeLit type (#1120)
- gop: add Tidy
- gop: NewImporter: support import Go+ packages
changes:
- gop: NewImporter: save fset
- gop: NewImporter: support gopmod.PkgtModule
- cmd/gop: gop mod tidy: cleanup before save
- mod:mod 0.9.10
- mod: c2go 0.7.6
- mod: libc 0.3.8