Merge pull request #635 from ui-router/dependabot/npm_and_yarn/rollup-1.21.4

Author: dependabot-preview[bot]

yarn.lock

@@ -4781,9 +4781,9 @@ rollup-pluginutils@^2.0.1, rollup-pluginutils@^2.8.1:
     estree-walker "^0.6.1"
 
 rollup@^1.15.5:
-  version "1.21.3"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.21.3.tgz#2d957e04b230b06a85b8c617bf594f92c37c4d5d"
-  integrity sha512-43CgeUtHhfiqBOUd0uJo5NEOg2FuheF3SqGN8BqgvnqB4xM2TbfPdudeSdllDcMKpagHb//qtpaAADBurT4GzA==
+  version "1.21.4"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.21.4.tgz#00a41a30f90095db890301b226cbe2918e4cf54d"
+  integrity sha512-Pl512XVCmVzgcBz5h/3Li4oTaoDcmpuFZ+kdhS/wLreALz//WuDAMfomD3QEYl84NkDu6Z6wV9twlcREb4qQsw==
   dependencies:
     "@types/estree" "0.0.39"
     "@types/node" "^12.7.5"