updating front-end deps

Author: alexandremagno

frontend/package-lock.json

@@ -115,7 +115,7 @@
     "react-moment": "^1.1.3",
     "react-phone-input-material-ui": "^2.17.4",
     "react-phone-number-input": "^3.2.18",
-    "react-placeholder": "^3.0.1",
+    "react-placeholder": "^4.1.0",
     "react-popper": "^1.3.2",
     "react-query-params": "^1.0.7",
     "react-redux": "^5.0.5",