fix(deps): update dependency typescript to ~3.1.0

Author: renovate-bot

package-lock.json

@@ -58,7 +58,7 @@
     "rxjs": "^5.5.0",
     "semaphore-async-await": "^1.5.1",
     "string-similarity": "^1.1.0",
-    "typescript": "~3.0.3",
+    "typescript": "~3.1.0",
     "vscode-jsonrpc": "^4.0.0",
     "vscode-languageserver": "^5.0.0",
     "vscode-languageserver-types": "^3.0.3"