Add missing jest-validate to dependencies (#500)

package.json

@@ -23,11 +23,11 @@
     "flow-parser": "0.38.0",
     "get-stdin": "5.0.1",
     "glob": "7.1.1",
+    "jest-validate": "18.2.0",
     "minimist": "1.2.0"
   },
   "devDependencies": {
     "jest": "18.0.0",
-    "jest-validate": "18.2.0",
     "rollup": "0.41.1",
     "rollup-plugin-commonjs": "7.0.0",
     "rollup-plugin-json": "2.1.0",