Update dependency rollup to v1.20.2

Author: renovate-bot

package.json

@@ -17,7 +17,7 @@
   },
   "devDependencies": {
     "prettier": "1.16.4",
-    "rollup": "1.20.1",
+    "rollup": "1.20.2",
     "rollup-plugin-node-resolve": "4.0.1"
   }
 }

yarn.lock

@@ -83,10 +83,10 @@ [email protected]:
     is-module "^1.0.0"
     resolve "^1.10.0"
 
-[email protected].1:
-  version "1.20.1"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.20.1.tgz#fc66f356c5afbd7c62434f1e7a53a1e7da5a2b32"
-  integrity sha512-8DV8eWLq84fbJFRqkjWg8BWX4NTTdHpx9bxjmTl/83z54o6Ygo1OgUDjJGFq/xe5i0kDspnbjzw2V+ZPXD/BrQ==
+[email protected].2:
+  version "1.20.2"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.20.2.tgz#0e1be13cb5de244c9c463027092f7c93461558b9"
+  integrity sha512-pF4jFzNWMUuudIAeiTgOcSxn8XkBN2Y2/IwPR7iL/IZ8k9RwoLyp2QwNWiYT+HF537zwpmzZHTBYw345H9vq1A==
   dependencies:
     "@types/estree" "0.0.39"
     "@types/node" "^12.7.2"