chore(deps-dev): bump rollup from 2.0.6 to 2.1.0

Bumps [rollup](https://github.com/rollup/rollup) from 2.0.6 to 2.1.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v2.0.6...v2.1.0)

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

web3.js/package-lock.json

@@ -20415,9 +20415,9 @@
       }
     },
     "rollup": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.0.6.tgz",
-      "integrity": "sha512-P42IlI6a/bxh52ed8hEXXe44LcHfep2f26OZybMJPN1TTQftibvQEl3CWeOmJrzqGbFxOA000QXDWO9WJaOQpA==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.1.0.tgz",
+      "integrity": "sha512-gfE1455AEazVVTJoeQtcOq/U6GSxwoj4XPSWVsuWmgIxj7sBQNLDOSA82PbdMe+cP8ql8fR1jogPFe8Wg8g4SQ==",
       "dev": true,
       "requires": {
         "fsevents": "~2.1.2"

web3.js/package.json

@@ -120,7 +120,7 @@
     "marked": "^0.8.0",
     "prettier": "^1.14.3",
     "rimraf": "3.0.2",
-    "rollup": "2.0.6",
+    "rollup": "2.1.0",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "^10.0.0",
     "rollup-plugin-copy": "^3.3.0",