Bump copyfiles from 1.2.0 to 2.0.0

Bumps [copyfiles](https://github.com/calvinmetcalf/copyfiles) from 1.2.0 to 2.0.0.
- [Release notes](https://github.com/calvinmetcalf/copyfiles/releases)
- [Commits](https://github.com/calvinmetcalf/copyfiles/compare/v1.2.0...v2.0.0)

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

packages/react-docs/package.json

@@ -29,7 +29,7 @@
         "@0xproject/monorepo-scripts": "^1.0.5",
         "@0xproject/tslint-config": "^1.0.5",
         "@types/compare-versions": "^3.0.0",
-        "copyfiles": "^1.2.0",
+        "copyfiles": "^2.0.0",
         "make-promises-safe": "^1.1.0",
         "shx": "^0.2.2",
         "tslint": "^5.9.1",