Fix a bug with getting the highest bump type

package.json

@@ -16,11 +16,17 @@
     "@actions/github": "^1.0.0",
     "@actions/io": "^1.0.0",
     "@actions/tool-cache": "^1.0.0",
+    "@babel/core": "^7.6.0",
+    "@babel/preset-env": "^7.6.0",
+    "@babel/preset-typescript": "^7.6.0",
     "@types/fs-extra": "^8.0.0",
+    "@types/jest": "^24.0.18",
     "@types/node": "^12.7.1",
+    "babel-jest": "^24.9.0",
     "fs-extra": "^8.1.0",
     "get-workspaces": "^0.4.0",
     "husky": "^3.0.3",
+    "jest": "^24.9.0",
     "mdast-util-to-string": "^1.0.6",
     "remark-parse": "^7.0.1",
     "remark-stringify": "^7.0.3",