refactor(config): Update devDependencies to use typescript 2.4.2

Author: ntilwalli

package.json

@@ -49,7 +49,7 @@
     "switch-path": "^1.2.0",
     "testem": "^1.16.1",
     "tslint": "^3.10.2",
-    "typescript": "^2.3.3",
+    "typescript": "^2.4.2",
     "uglify-js": "^3.0.12",
     "validate-commit-message": "^3.0.1",
     "xstream": "^10.8.0"