Fixes reactjs#51: Declare eslint dependency (reactjs#252)

Author: laurens-dg

package.json

@@ -12,6 +12,7 @@
  },
  "dependencies": {
  "chalk": "^2.4.2",
+ "eslint": "^6.6.0",
  "execa": "^3.2.0",
  "globby": "^10.0.1",
  "inquirer": "^7.0.0",