Make firebase-admin a peer dependency (#8)

Author: laurenzlong

package.json

@@ -31,21 +31,22 @@
   "homepage": "https://github.com/firebase/firebase-functions-test#readme",
   "dependencies": {
     "@types/lodash": "^4.14.104",
-    "firebase-admin": "^5.11.0",
     "lodash": "^4.17.5"
   },
   "devDependencies": {
     "@types/chai": "^4.1.2",
     "@types/mocha": "^5.0.0",
     "chai": "^4.1.2",
-    "firebase-functions": "^1.0.0",
+    "firebase-functions": "^1.0.1",
+    "firebase-admin": "^5.12.0",
     "mocha": "^5.0.5",
     "sinon": "^4.4.9",
     "tslint": "^5.8.0",
     "typescript": "^2.4.1"
   },
   "peerDependencies": {
-    "firebase-functions": "^1.0.0"
+    "firebase-functions": "^1.0.1",
+    "firebase-admin": "^5.12.0"
   },
   "engines": {
     "node": ">=6.0.0"