adding missing metadata for the language. (#539)

Author: Janther

src/index.js

@@ -1,16 +1,21 @@
 const { handleComments, printComment } = require('./comments');
-
 const massageAstNode = require('./clean');
 const loc = require('./loc');
 const options = require('./options');
 const parse = require('./parser');
 const print = require('./printer');
 
 // https://prettier.io/docs/en/plugins.html#languages
+// https://github.com/ikatyang/linguist-languages/blob/master/data/Solidity.json
 const languages = [
   {
-    extensions: ['.sol'],
+    linguistLanguageId: 237469032,
     name: 'Solidity',
+    type: 'programming',
+    color: '#AA6746',
+    aceMode: 'text',
+    tmScope: 'source.solidity',
+    extensions: ['.sol'],
     parsers: ['solidity-parse'],
     vscodeLanguageIds: ['solidity']
   }