fix: pin vscode-jsonrpc to 3.3.0

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "semaphore-async-await": "^1.5.1",
     "string-similarity": "^1.1.0",
     "typescript": "2.3.4",
-    "vscode-jsonrpc": "^3.1.0",
+    "vscode-jsonrpc": "3.3.0",
     "vscode-languageserver": "^3.1.0",
     "vscode-languageserver-types": "^3.0.3"
   },