updating front-end deps

Author: alexandremagno

frontend/package-lock.json

@@ -111,7 +111,7 @@
     "react-google-recaptcha": "^2.1.0",
     "react-intl": "^5.0",
     "react-intl-redux": "^2.3.0",
-    "react-mailchimp-subscribe": "^1.0.2",
+    "react-mailchimp-subscribe": "^2.1.3",
     "react-moment": "^0.7.0",
     "react-phone-input-material-ui": "^2.17.4",
     "react-phone-number-input": "^3.2.18",