Update dependency rollup to v1.20.1

Author: renovate-bot

package.json

@@ -17,7 +17,7 @@
   },
   "devDependencies": {
     "prettier": "1.16.4",
-    "rollup": "1.19.4",
+    "rollup": "1.20.1",
     "rollup-plugin-node-resolve": "4.0.1"
   }
 }

yarn.lock

@@ -7,10 +7,10 @@
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.39.tgz#e177e699ee1b8c22d23174caaa7422644389509f"
   integrity sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==
 
-"@types/node@^12.6.9":
-  version "12.7.1"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.7.1.tgz#3b5c3a26393c19b400844ac422bd0f631a94d69d"
-  integrity sha512-aK9jxMypeSrhiYofWWBf/T7O+KwaiAHzM4sveCdWPn71lzUSMimRnKzhXDKfKwV1kWoBo2P1aGgaIYGLf9/ljw==
+"@types/node@^12.7.2":
+  version "12.7.2"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.7.2.tgz#c4e63af5e8823ce9cc3f0b34f7b998c2171f0c44"
+  integrity sha512-dyYO+f6ihZEtNPDcWNR1fkoTDf3zAK3lAABDze3mz6POyIercH0lEUawUFXlG8xaQZmm1yEBON/4TsYv/laDYg==
 
 "@vaadin/router@1.2.0":
   version "1.2.0"
@@ -32,10 +32,10 @@
   dependencies:
     "@vaadin/vaadin-development-mode-detector" "^2.0.0"
 
-acorn@^6.2.1:
-  version "6.2.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.2.1.tgz#3ed8422d6dec09e6121cc7a843ca86a330a86b51"
-  integrity sha512-JD0xT5FCRDNyjDda3Lrg/IxFscp9q4tiYtxE1/nOzlKCk7hIRuYjhq1kCNkbPjMRMZuFq20HNQn1I9k8Oj0E+Q==
+acorn@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.0.0.tgz#26b8d1cd9a9b700350b71c0905546f64d1284e7a"
+  integrity sha512-PaF/MduxijYYt7unVGRuds1vBC9bFxbNf+VWqhOClfdgy7RlVkQqt610ig1/yxTgsDIfW1cWDel5EBbOy3jdtQ==
 
 builtin-modules@^3.0.0:
   version "3.0.0"
@@ -83,11 +83,11 @@ rollup-plugin-node-resolve@4.0.1:
     is-module "^1.0.0"
     resolve "^1.10.0"
 
-rollup@1.19.4:
-  version "1.19.4"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.19.4.tgz#0cb4e4d6fa127adab59b11d0be50e8dd1c78123a"
-  integrity sha512-G24w409GNj7i/Yam2cQla6qV2k6Nug8bD2DZg9v63QX/cH/dEdbNJg8H4lUm5M1bRpPKRUC465Rm9H51JTKOfQ==
+rollup@1.20.1:
+  version "1.20.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.20.1.tgz#fc66f356c5afbd7c62434f1e7a53a1e7da5a2b32"
+  integrity sha512-8DV8eWLq84fbJFRqkjWg8BWX4NTTdHpx9bxjmTl/83z54o6Ygo1OgUDjJGFq/xe5i0kDspnbjzw2V+ZPXD/BrQ==
   dependencies:
     "@types/estree" "0.0.39"
-    "@types/node" "^12.6.9"
-    acorn "^6.2.1"
+    "@types/node" "^12.7.2"
+    acorn "^7.0.0"