fix(package.json): install missing dependency

Author: DawChihLiou

package-lock.json

@@ -24,6 +24,7 @@
     "chalk": "^2.4.1",
     "commitizen": "^4.0.3",
     "conventional-commit-types": "^3.0.0",
+    "git-branch": "^2.0.1",
     "lodash.map": "^4.5.1",
     "longest": "^2.0.1",
     "word-wrap": "^1.0.3"