Specific interface for provider enhancement (3/3) (#1023)

* adding in crashlytics changes

* comments & adding package refs

* address comments and make doc strings better

* add opts.retry to event trigger

Author: colerogers

package.json

@@ -57,7 +57,8 @@
     "./v2/storage": "./lib/v2/providers/storage.js",
     "./v2/alerts": "./lib/v2/providers/alerts/index.js",
     "./v2/alerts/appDistribution": "./lib/v2/providers/alerts/appDistribution.js",
-    "./v2/alerts/billing": "./lib/v2/providers/alerts/billing.js"
+    "./v2/alerts/billing": "./lib/v2/providers/alerts/billing.js",
+    "./v2/alerts/crashlytics": "./lib/v2/providers/alerts/crashlytics.js"
   },
   "typesVersions": {
     "*": {
@@ -126,6 +127,9 @@
       ],
       "v2/alerts/billing": [
         "lib/v2/providers/alerts/billing"
+      ],
+      "v2/alerts/crashlytics": [
+        "lib/v2/providers/alerts/crashlytics"
       ]
     }
   },