using string interplation at G1_Function
python and bun supports StringInterpolation
adding test_bun
adding release.PythonGenerator
Merge branch 'master' of github.com:libbun/libbun
adding Init in Parser
adding self-assignment and incremental/decremental operators
update shell grammar and add test case
Merge pull request #72 from sekiguchi-nagisa/master

update shell grammar and add test case