chore(deps-dev): bump np from 5.2.1 to 6.0.0

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] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -74,7 +74,7 @@
     "father": "^2.22.0",
     "immutability-helper": "^3.0.0",
     "less": "^3.10.3",
-    "np": "^5.1.0",
+    "np": "^6.0.0",
     "prettier": "^1.11.1",
     "rc-animate": "^2.10.1",
     "rc-dropdown": "~2.4.1",