fix(package.json): limit to supported TS versions

Constrain the allowed versions of `typescript` to a maximum of `2.2.x`.

Since the supported versions of typescript [maxes out at 2.2] (1), this
package should not express support for higher versions of the package
(i.e. if typescript v2.3.0 were to exist, there would be a repeat of

1: https://github.com/mgechev/codelyzer/blob/28059b141c77dd6808bc748ea86285805af17f1e/src/util/syntaxKind.ts#L2806-L2809

related to mgechev#149

package.json

@@ -61,7 +61,7 @@
     "rxjs": "5.0.1",
     "ts-node": "1.2.2",
     "tslint": "^4.0.0",
-    "typescript": "^2.1.4",
+    "typescript": "2.1.4 - 2.2",
     "zone.js": "^0.7.2"
   },
   "peerDependencies": {