chore(package): update react-modal to version 3.1.12

package.json

@@ -77,7 +77,7 @@
     "react-ga": "2.4.1",
     "react-intl": "2.4.0",
     "react-intl-redux": "0.6.0",
-    "react-modal": "3.1.11",
+    "react-modal": "3.1.12",
     "react-redux": "5.0.6",
     "react-responsive": "4.0.3",
     "react-style-proptype": "3.1.0",