chore(deps-dev): bump rollup from 1.15.3 to 1.15.4

Bumps [rollup](https://github.com/rollup/rollup) from 1.15.3 to 1.15.4.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v1.15.3...v1.15.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -57,7 +57,7 @@
     "markdownlint-cli": "^0.17.0",
     "npm-run-all": "^4.1.5",
     "prettier": "^1.18.2",
-    "rollup": "^1.15.3",
+    "rollup": "^1.15.4",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-terser": "^5.0.0"
   },

yarn.lock

@@ -5287,10 +5287,10 @@ rollup-pluginutils@^2.3.0:
   dependencies:
     estree-walker "^0.6.1"
 
-rollup@^1.15.3:
-  version "1.15.3"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.15.3.tgz#bb5875cf33eba5ef0fe3d6ed84b9e099ec94b3df"
-  integrity sha512-u2TVHLE/iUvFNAVSQb2DT6XEydOkgEHGLoRnY4jKJiZR/lmhqOM+ofGwSVbHhysZheAakqIa7B/3gChoK9VY0w==
+rollup@^1.15.4:
+  version "1.15.4"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.15.4.tgz#3d6d8cbc8f19651d63acdacf874da2f9ed06c8ba"
+  integrity sha512-EjdjLZ6K5z3J7NkboB+aPVBthZt1CexD7u0IIcc7NYGoXAFyV6AbdKrS8elfwGNrYmuBC5ZDOSOzwH9Ad4PQKg==
   dependencies:
     "@types/estree" "0.0.39"
     "@types/node" "^12.0.8"