Bump actions/github to 2.2.0 to support GHES (#72)

* Bumping actions/github to 2.2.0

* Husky commit correct node modules

node_modules/@actions/github/lib/context.d.ts

@@ -14,12 +14,12 @@ export declare class Context {
      * Hydrate the context from the environment
      */
     constructor();
-    readonly issue: {
+    get issue(): {
         owner: string;
         repo: string;
         number: number;
     };
-    readonly repo: {
+    get repo(): {
         owner: string;
         repo: string;
     };