chore(deps-dev): bump rollup from 0.68.1 to 0.68.2

Bumps [rollup](https://github.com/rollup/rollup) from 0.68.1 to 0.68.2.
- [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/v0.68.1...v0.68.2)

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

web3.js/package-lock.json

@@ -13928,13 +13928,13 @@
       }
     },
     "rollup": {
-      "version": "0.68.1",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-0.68.1.tgz",
-      "integrity": "sha512-8DNKos2p/B7gDoxI42kyIHHX8d+Zt+bwhjUgXnTqnSP+CSPkRNNIQyHIcTqeGdYWR70qG6c1DaRcrjWAiG6Akg==",
+      "version": "0.68.2",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-0.68.2.tgz",
+      "integrity": "sha512-WgjNCXYv7ZbtStIap1+tz4pd2zwz0XYN//OILwEY6dINIFLVizK1iWdu+ZtUURL/OKnp8Lv2w8FBds8YihzX7Q==",
       "dev": true,
       "requires": {
         "@types/estree": "0.0.39",
-        "@types/node": "9.6.6"
+        "@types/node": "*"
       }
     },
     "rollup-plugin-babel": {

web3.js/package.json

@@ -109,7 +109,7 @@
     "marked": "^0.5.1",
     "prettier": "^1.14.3",
     "rimraf": "2.6.2",
-    "rollup": "0.68.1",
+    "rollup": "0.68.2",
     "rollup-plugin-babel": "3.0.7",
     "rollup-plugin-commonjs": "9.2.0",
     "rollup-plugin-json": "^3.0.0",