Update package.json (#131)

1. Update the release version to 0.5.1 (no RC)
2. Change the peer dependency on firebase-admin to be a "~" dependency. With a 3-digit semver this means that our dependency must be locked to the minor release (and no less than the revision). This means that we'll be protected from breaking TypeScript customers if firebase-admin agrees to put all new members in minor revisions. The downside of this is that firebase-functions will have many more version bumps (possibly just to change our peer dependency) and firebase-admin will climb its minor version # much faster.

Author: inlined

package.json

@@ -1,6 +1,6 @@
 {
   "name": "firebase-functions",
-  "version": "0.5.1-rc1",
+  "version": "0.5.1",
   "description": "Firebase SDK for Cloud Functions",
   "main": "lib/index.js",
   "scripts": {
@@ -48,7 +48,7 @@
     "typescript": "^2.0.3"
   },
   "peerDependencies": {
-    "firebase-admin": "^4.1.2"
+    "firebase-admin": "~4.1.2"
   },
   "dependencies": {
     "@types/express": "^4.0.33",