fix(package): update react to version 16.3.0

Closes #16

Author: greenkeeper[bot]

package.json

@@ -8,7 +8,7 @@
     "mcs-lite-theme": "^0.3.1",
     "mcs-lite-ui": "^0.4.1",
     "normalize.css": "^7.0.0",
-    "react": "^15.5.4",
+    "react": "^16.3.0",
     "react-dom": "^15.5.4",
     "styled-components": "^2.0.0"
   },