Merge pull request #1624 from gruntjs/rm-bump-deps

Remove old bump task and deps

Author: shama

internal-tasks/bump.js

@@ -60,8 +60,6 @@
     "grunt-contrib-nodeunit": "~1.0.0",
     "grunt-contrib-watch": "~1.0.0",
     "grunt-eslint": "~18.1.0",
-    "semver": "5.3.0",
-    "shelljs": "~0.7.8",
     "temporary": "~0.0.4",
     "through2": "~2.0.0"
   },