Update dependency firebaseui to v4

package.json

@@ -29,7 +29,7 @@
     "eslint-plugin-react": "^7.7.0",
     "extract-text-webpack-plugin": "^3.0.2",
     "firebase": "^4.10.0",
-    "firebaseui": "^2.6.1",
+    "firebaseui": "^4.0.0",
     "html-webpack-plugin": "^2.30.1",
     "jquery": "^3.3.1",
     "node-sass": "^4.7.2",

yarn.lock

@@ -3586,7 +3586,7 @@ find-up@^2.0.0, find-up@^2.1.0:
   dependencies:
     locate-path "^2.0.0"
 
-firebase@^4.10.0, firebase@^4.3.1:
+firebase@^4.10.0:
   version "4.10.0"
   resolved "https://registry.yarnpkg.com/firebase/-/firebase-4.10.0.tgz#52cfcd635ba3f97e4bc2e2c88581e8ad97c2c19a"
   dependencies:
@@ -3600,12 +3600,13 @@ firebase@^4.10.0, firebase@^4.3.1:
     dom-storage "^2.0.2"
     xmlhttprequest "^1.8.0"
 
-firebaseui@^2.6.1:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/firebaseui/-/firebaseui-2.6.1.tgz#f072092422b5d4cd064c55f0baae114dd32d7c21"
+firebaseui@^4.0.0:
+  version "4.8.0"
+  resolved "https://registry.yarnpkg.com/firebaseui/-/firebaseui-4.8.0.tgz#74c10a30db17f2cbfe020c91b97d5e3c6e8efbbc"
+  integrity sha512-DG8CD+969JHMailhOm8nKo+eJlumIHex0TH18eJeTo0Q2KEt5m/b61S1ky4bavK/nGmLJBRECJytq09/pwhZ0A==
   dependencies:
     dialog-polyfill "^0.4.7"
-    firebase "^4.3.1"
+    material-design-lite "^1.2.0"
 
 first-chunk-stream@^1.0.0:
   version "1.0.0"
@@ -5203,6 +5204,11 @@ marked@^0.3.9:
   version "0.3.19"
   resolved "https://registry.yarnpkg.com/marked/-/marked-0.3.19.tgz#5d47f709c4c9fc3c216b6d46127280f40b39d790"
 
+material-design-lite@^1.2.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/material-design-lite/-/material-design-lite-1.3.0.tgz#d004ce3fee99a1eeb74a78b8a325134a5f1171d3"
+  integrity sha1-0ATOP+6Zoe63Sni4oyUTSl8RcdM=
+
 math-expression-evaluator@^1.2.14:
   version "1.2.17"
   resolved "https://registry.yarnpkg.com/math-expression-evaluator/-/math-expression-evaluator-1.2.17.tgz#de819fdbcd84dccd8fae59c6aeb79615b9d266ac"