build(deps-dev): bump np from 5.2.1 to 6.0.0 (#308)

Bumps [np](https://github.com/sindresorhus/np) from 5.2.1 to 6.0.0.
- [Release notes](https://github.com/sindresorhus/np/releases)
- [Commits](sindresorhus/np@v5.2.1...v6.0.0)

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

Author: dependabot-preview[bot]

package.json

@@ -66,7 +66,7 @@
     "enzyme-to-json": "^3.4.0",
     "father": "^2.22.0",
     "less": "^3.10.3",
-    "np": "^5.0.3",
+    "np": "^6.0.0",
     "prop-types": "^15.5.6",
     "react": "^16.9.0",
     "react-dom": "^16.9.0",