Use the original Kotlin package instead of a fork

The fork is identical to the original.

grammars.yml

@@ -53,8 +53,6 @@ https://github.com/SublimeText/ColdFusion:
 - source.cfscript.cfc
 - text.cfml.basic
 - text.html.cfm
-https://github.com/SublimeText/Kotlin/raw/master/Kotlin.tmLanguage:
-- source.Kotlin
 https://github.com/SublimeText/NSIS:
 - source.nsis
 https://github.com/Varriount/NimLime:
@@ -381,6 +379,8 @@ https://github.com/tomas-stefano/smalltalk-tmbundle:
 - source.smalltalk
 https://github.com/vic/ioke-outdated/raw/master/share/TextMate/Ioke.tmbundle/Syntaxes/Ioke.tmLanguage:
 - source.ioke
+https://github.com/vkostyukov/kotlin-sublime-package:
+- source.Kotlin
 https://github.com/vmg/zephir-sublime:
 - source.php.zephir
 https://github.com/whitequark/llvm.tmbundle: