enh(java) class definitions could start with keyword enum (#2643)

Author: yeoleobun

CHANGES.md

@@ -9,11 +9,13 @@ Language Improvements:
 - enh(matlab) Add new R2019b `arguments` keyword and fix `enumeration` keyword (#2619) [Andrew Janke][]
 - fix(kotlin) Remove very old keywords and update example code (#2623) [kageru][]
 - fix(night) Prevent object prototypes method values from being returned in `getLanguage` (#2636) [night][]
+- enh(java) Add support for `enum`, which will identify as a `class` now (#2643) [ezksd][]
 
 [Andrew Janke]: https://github.com/apjanke
 [Samia Ali]: https://github.com/samiaab1990
 [kageru]: https://github.com/kageru
 [night]: https://github.com/night
+[ezksd]: https://github.com/ezksd
 
 
 ## Version 10.1.1

src/languages/java.js

@@ -98,8 +98,8 @@ export default function(hljs) {
       hljs.QUOTE_STRING_MODE,
       {
         className: 'class',
-        beginKeywords: 'class interface', end: /[{;=]/, excludeEnd: true,
-        keywords: 'class interface',
+        beginKeywords: 'class interface enum', end: /[{;=]/, excludeEnd: true,
+        keywords: 'class interface enum',
         illegal: /[:"\[\]]/,
         contains: [
           { beginKeywords: 'extends implements' },