fix: specify as able to lint on changes

This was switched in #41, but no reasoning was given. Since it appears 
the server handles this we should re-enable it.

Fixes #48.

Author: Arcanemagus

lib/index.js

@@ -64,7 +64,7 @@ export function provideLinter() {
   return {
     name: 'Julia',
     scope: 'file',
-    lintsOnChange: false,
+    lintsOnChange: true,
     grammarScopes: ['source.julia'],
     async lint(textEditor: Object) {
       if (!spawnedServer) {