fix: yarn throws an error due to engine field

Author: Daniel Schmidt

package.json

@@ -7,10 +7,6 @@
     "email": "[email protected]",
     "url": "http://www.mesosphere.com"
   },
-  "engines": {
-    "node": "8.15.x",
-    "npm": "6.8.x"
-  },
   "repository": {
     "type": "git",
     "url": "https://github.com/mesosphere/reactjs-components"
@@ -108,4 +104,4 @@
     "stylelint": "stylelint src/**/*.less  docs/src/**/*.less",
     "preversion": "npm run clean && npm run dist-src"
   }
-}
+}