build: update rollup to version ~2.20.0

Author: renovate-bot

package.json

@@ -83,7 +83,7 @@
     "node-fetch": "^2.2.0",
     "protractor": "7.0.0",
     "puppeteer": "~5.0.0",
-    "rollup": "~2.19.0",
+    "rollup": "~2.20.0",
     "rollup-plugin-commonjs": "^10.1.0",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-sourcemaps": "^0.6.0",

yarn.lock

@@ -8708,10 +8708,10 @@ [email protected]:
   optionalDependencies:
     fsevents "~2.1.2"
 
-rollup@~2.19.0:
-  version "2.19.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.19.0.tgz#6484868882281552b0dc33aa5bc5b36a9c920452"
-  integrity sha512-nny5Vs4jwY3vbQAXgOyU4ZDZqLvMKm/umnsVry/demVL6ve8ke1XhdpYE0eiWencASmx/qFPw6pP8P7MLJl9XA==
+rollup@~2.20.0:
+  version "2.20.0"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.20.0.tgz#7456fed8424a5247954958751642e9fdd0ad7485"
+  integrity sha512-hkbp//ne1om8+PQRpd81zk0KDvbJxkLZdZJh1ZNxjd1EkI0H1TmYuHqqXx88yciS+5YnMom3geubQjTeeUnNNw==
   optionalDependencies:
     fsevents "~2.1.2"