chore(deps): update dependency gh-pages to v1.2.0

Author: renovate-bot

package-lock.json

@@ -56,7 +56,7 @@
     "eslint-plugin-import": "2.12.0",
     "eslint-plugin-jest": "21.17.0",
     "eslint-plugin-prettier": "2.6.0",
-    "gh-pages": "1.1.0",
+    "gh-pages": "1.2.0",
     "jest": "21.2.1",
     "jsdom": "11.11.0",
     "json": "9.0.6",