chore(deps): update dependency rollup to v2.7.6

Author: renovate-bot

package-lock.json

@@ -53,7 +53,7 @@
     "jest": "25.4.0",
     "lint-staged": "10.1.7",
     "prettier": "2.0.5",
-    "rollup": "2.7.2",
+    "rollup": "2.7.6",
     "rollup-plugin-babel": "4.4.0",
     "rollup-plugin-uglify": "6.0.4",
     "sinon": "9.0.2",