Fix #201 Support elif in Cabal files

Author: mpilgrem

CHANGELOG.md

@@ -4,6 +4,7 @@
 - Add support for `\cases` syntax ([#218](https://github.com/JustusAdam/language-haskell/pull/218)), thanks to [@mixphix](https://github.com/mixphix)
 - Fix bare unit type applications ([#225](https://github.com/JustusAdam/language-haskell/issue/225)), thanks to [@mixphix](https://github.com/mixphix)
 - Fix qualified type operators in export lists ([#191](https://github.com/JustusAdam/language-haskell/issue/191)), thanks to [@mixphix]
+- Add support for `elif` in Cabal files (`cabal-version` >= 2.2) ([#236](https://github.com/JustusAdam/language-haskell/pull/236))
 
 ## 3.6.0 - 15.03.2022
 

syntaxes/cabal.YAML-tmLanguage

@@ -94,7 +94,7 @@ patterns:
       '1': {name: entity.name.section.cabal}
       '3': {name: entity.name.function.cabal}
   - name: keyword.control.cabal
-    match: '^[ \t]*(if|else)'
+    match: '^[ \t]*(if|elif|else)'
   - name: comment.line.double-dash
     match: '^\s*--.*$'
 scopeName: source.cabal