feat: Additional commit information

Add `author`, `commiter`, `gitTags` and `committerDate` to the commit object passed to plugin

package.json

@@ -25,7 +25,9 @@
     "debug": "^3.1.0",
     "execa": "^0.8.0",
     "fs-extra": "^4.0.2",
+    "get-stream": "^3.0.0",
     "git-head": "^1.2.1",
+    "git-log-parser": "^1.2.0",
     "github": "^12.0.0",
     "lodash": "^4.0.0",
     "marked": "^0.3.6",
@@ -52,7 +54,6 @@
     "eslint-plugin-prettier": "^2.3.0",
     "eslint-plugin-promise": "^3.5.0",
     "eslint-plugin-standard": "^3.0.1",
-    "get-stream": "^3.0.0",
     "mockserver-client": "^1.0.16",
     "nock": "^9.0.2",
     "npm-registry-couchapp": "^2.6.12",