Update version

Swift 4.1.1

Merge pull request yanagiba#83 from ryuichis/swift-4.1-migration

Swift 4.1 Migration

Merge pull request yanagiba#52 from ryuichis/releases/0.4.1

Dump version with fixed Bocho release

Merge pull request yanagiba#51 from ryuichis/prefix-variable-name

Allow prefix to be used as identifier pattern

Pump version to 0.3.5

Merge pull request yanagiba#27 from ryuichis/expose-comments

Expose comments

Merge pull request yanagiba#26 from ryuichis/fix-raw-value-enum-decl

Support boolean type raw-value enum decl

Merge pull request yanagiba#25 from ryuichis/new-optional-pattern

Extending OptionalPattern

Merge pull request yanagiba#23 from ryuichis/spm-4

Use SPM 4 description and pump version to 0.3.1