chore(deps-dev): bump rollup from 1.5.0 to 1.6.0

Bumps [rollup](https://github.com/rollup/rollup) from 1.5.0 to 1.6.0.
- [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/v1.5.0...v1.6.0)

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

web3.js/package-lock.json

@@ -16398,9 +16398,9 @@
       }
     },
     "rollup": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.5.0.tgz",
-      "integrity": "sha512-xs32mjZhXmUPL+1u300YKFoN/Oqa0VoOkVu/5/bf2n60NpHgoO2L1mevuZg4ltkjrcO2dUfaTvCZzD3BPuAyQQ==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.6.0.tgz",
+      "integrity": "sha512-qu9iWyuiOxAuBM8cAwLuqPclYdarIpayrkfQB7aTGTiyYPbvx+qVF33sIznfq4bxZCiytQux/FvZieUBAXivCw==",
       "dev": true,
       "requires": {
         "@types/estree": "0.0.39",
@@ -16409,9 +16409,9 @@
       },
       "dependencies": {
         "@types/node": {
-          "version": "11.10.5",
-          "resolved": "https://registry.npmjs.org/@types/node/-/node-11.10.5.tgz",
-          "integrity": "sha512-DuIRlQbX4K+d5I+GMnv+UfnGh+ist0RdlvOp+JZ7ePJ6KQONCFQv/gKYSU1ZzbVdFSUCKZOltjmpFAGGv5MdYA==",
+          "version": "11.11.3",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-11.11.3.tgz",
+          "integrity": "sha512-wp6IOGu1lxsfnrD+5mX6qwSwWuqsdkKKxTN4aQc4wByHAKZJf9/D4KXPQ1POUjEbnCP5LMggB0OEFNY9OTsMqg==",
           "dev": true
         },
         "acorn": {

web3.js/package.json

@@ -111,7 +111,7 @@
     "marked": "^0.6.0",
     "prettier": "^1.14.3",
     "rimraf": "2.6.3",
-    "rollup": "1.5.0",
+    "rollup": "1.6.0",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "9.2.1",
     "rollup-plugin-json": "^3.0.0",