chore(package): upgrade to typescript 2.4.2 (#356)

Author: tomv564

Diff for: package.json

@@ -50,7 +50,7 @@
     "opentracing": "^0.14.0",
     "semaphore-async-await": "^1.5.1",
     "string-similarity": "^1.1.0",
-    "typescript": "2.3.4",
+    "typescript": "2.4.2",
     "vscode-jsonrpc": "^3.3.1",
     "vscode-languageserver": "^3.1.0",
     "vscode-languageserver-types": "^3.0.3"