chore(package): remove unused libraries: shelljs, shx

Author: christopherthielen

package.json

@@ -103,8 +103,6 @@
     "rollup-plugin-node-resolve": "^3.3.0",
     "rollup-plugin-sourcemaps": "^0.4.2",
     "rollup-plugin-uglify": "^3.0.0",
-    "shelljs": "^0.8.1",
-    "shx": "^0.2.2",
     "ts-loader": "^4.1.0",
     "tslint": "^5.9.1",
     "tslint-eslint-rules": "^5.1.0",