chore(deps): Move rimraf to devDependencies

Author: schickling

package.json

@@ -55,6 +55,7 @@
     "babel-preset-es2015": "6.24.1",
     "babel-preset-stage-0": "6.24.1",
     "cpx": "1.5.0",
+    "rimraf": "^2.6.2",
     "tslint": "5.8.0",
     "tslint-config-standard": "7.0.0",
     "typescript": "2.6.2"
@@ -64,7 +65,6 @@
     "graphql-import": "^0.3.0",
     "graphql-request": "^1.4.0",
     "js-yaml": "^3.10.0",
-    "minimatch": "^3.0.4",
-    "rimraf": "^2.6.2"
+    "minimatch": "^3.0.4"
   }
 }