Update vscode-languageclient to 3.3.0

Author: daviwil

package.json

@@ -37,7 +37,7 @@
     "onCommand:PowerShell.RestartSession"
   ],
   "dependencies": {
-    "vscode-languageclient": "3.3.0-alpha.6"
+    "vscode-languageclient": "3.3.0"
   },
   "devDependencies": {
     "@types/node": "^6.0.40",