Recognize as in imports as a keyword

Fixes scala#264

Author: nicolasstucki

src/typescript/Scala.tmLanguage.ts

@@ -57,6 +57,10 @@ export const scalaTmLanguage: TmLanguage = {
           match: '\\b(given)\\b',
           name: 'keyword.other.import.given.scala'
         },
+        {
+          match: '\\s(as)\\s',
+          name: 'keyword.other.import.as.scala'
+        },
         {
           match: idUpper,
           name: 'entity.name.class.import.scala'