Merge pull request #210 from JuliaLang/sp/add-some-more-arrows

feat: add some more arrow ops

0.5.27

bump version

0.5.25

## Tokenize v0.5.21

[Diff since v0.5.20](v0.5.20...v0.5.21)


**Closed issues:**
- Tokenize 0.5.19 broke JuMPs formatting (#189)

**Merged pull requests:**
- #188, but fixed (#191) (@pfitzseb)

## Tokenize v0.5.20

[Diff since v0.5.19](v0.5.19...v0.5.20)



**Merged pull requests:**
- Revert "Simplify lex_identifier" (#190) (@KristofferC)

## Tokenize v0.5.19

[Diff since v0.5.18](v0.5.18...v0.5.19)



**Merged pull requests:**
- RFC: change optimization level to 1 (#187) (@KristofferC)
- Simplify lex_identifier (#188) (@ZacLN)

## Tokenize v0.5.18

[Diff since v0.5.17](v0.5.17...v0.5.18)



**Merged pull requests:**
- Add LEFT_ARROW and DOUBLE_ARROW (#184) (@pfitzseb)
- add additional operator suffixes (#185) (@pfitzseb)
- lex all of Base in tests (#186) (@pfitzseb)