force typescript <3.7 due to microsoft/TypeScript#33939

Author: endel

package.json

@@ -1,6 +1,6 @@
 {
   "name": "colyseus.js",
-  "version": "0.11.6",
+  "version": "0.11.7",
   "description": "Multiplayer Game Client for the Browser",
   "keywords": [
     "colyseus",
@@ -58,7 +58,7 @@
     "ts-loader": "^2.3.7",
     "ts-node": "^6.0.3",
     "tslint": "^5.9.1",
-    "typescript": "^3.3.3",
+    "typescript": "~3.5.0",
     "uglify-js": "^2.6.1",
     "webpack": "^3.6.0",
     "ws": "^6.1.2"