@actions/github v3 using Octokit/core (#453)

* Rebuild to use @Octokit/Core

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/github",
-  "version": "2.2.0",
+  "version": "3.0.0",
   "description": "Actions github lib",
   "keywords": [
     "github",
@@ -38,8 +38,9 @@
   },
   "dependencies": {
     "@actions/http-client": "^1.0.3",
-    "@octokit/graphql": "^4.3.1",
-    "@octokit/rest": "^16.43.1"
+    "@octokit/core": "^2.5.1",
+    "@octokit/plugin-paginate-rest": "^2.2.0",
+    "@octokit/plugin-rest-endpoint-methods": "^3.10.0"
   },
   "devDependencies": {
     "jest": "^25.1.0",