Update dependency rollup to v1.20.3

Author: renovate-bot

package.json

@@ -17,7 +17,7 @@
   },
   "devDependencies": {
     "prettier": "1.16.4",
-    "rollup": "1.20.2",
+    "rollup": "1.20.3",
     "rollup-plugin-node-resolve": "4.0.1"
   }
 }

yarn.lock

@@ -83,10 +83,10 @@ rollup-plugin-node-resolve@4.0.1:
     is-module "^1.0.0"
     resolve "^1.10.0"
 
-rollup@1.20.2:
-  version "1.20.2"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.20.2.tgz#0e1be13cb5de244c9c463027092f7c93461558b9"
-  integrity sha512-pF4jFzNWMUuudIAeiTgOcSxn8XkBN2Y2/IwPR7iL/IZ8k9RwoLyp2QwNWiYT+HF537zwpmzZHTBYw345H9vq1A==
+rollup@1.20.3:
+  version "1.20.3"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.20.3.tgz#6243f6c118ca05f56b2d9433112400cd834a1eb8"
+  integrity sha512-/OMCkY0c6E8tleeVm4vQVDz24CkVgvueK3r8zTYu2AQNpjrcaPwO9hE+pWj5LTFrvvkaxt4MYIp2zha4y0lRvg==
   dependencies:
     "@types/estree" "0.0.39"
     "@types/node" "^12.7.2"