Merge pull request #4 from ClayWangT/ClayWangT-patch-1

[chore] code reformat

[fix] sandbox reduceRight

[fix] sandbox reducer behavior

[fix] async func failure

[release] 0.1.18

[fix] optional chain

[release] 0.1.17

[fix] wrong scope chain

[chore] change tests

[release] 0.1.16

[fix] fail to get cur scope

[release] 0.1.15

[chore] rm useless code

[perf] optimize