chore: update dependency rollup to v1.6.1

Author: renovate-bot

package.json

@@ -63,7 +63,7 @@
     "jest": "24.3.1",
     "npm-run-all": "4.1.5",
     "prettier": "1.16.4",
-    "rollup": "1.4.1",
+    "rollup": "1.6.1",
     "rollup-plugin-typescript2": "0.19.3",
     "rollup-watch": "4.3.1",
     "ts-jest": "24.0.0",

yarn.lock

@@ -4296,10 +4296,10 @@ [email protected]:
     require-relative "0.8.7"
     rollup-pluginutils "^2.0.1"
 
-rollup@1.4.1:
-  version "1.4.1"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.4.1.tgz#cc03ef6fb49dd72a878e3da0131c0a3696de14a7"
-  integrity sha512-YWf5zeR6SWtqZmCnuYs4a+ZJetj8NT4yfBMPXekWHW4L3144jM+J2AWagQVejB0FwCqjEUP9l8o4hg1rPDfQlg==
+rollup@1.6.1:
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.6.1.tgz#b1f2edc949d78186fb487597b28dd9717b8bc20f"
+  integrity sha512-2giWBZjBepr/25vkds/EzpC52xySDyhX1wPGaJ69cnZJHCuYTzIJKFzJB1DTZ8C7A1FocBbG0KhS/No3whXmzw==
   dependencies:
     "@types/estree" "0.0.39"
     "@types/node" "^11.9.5"