chore(deps): bump del from 6.1.1 to 7.1.0

Bumps [del](https://github.com/sindresorhus/del) from 6.1.1 to 7.1.0.
- [Release notes](https://github.com/sindresorhus/del/releases)
- [Commits](sindresorhus/del@v6.1.1...v7.1.0)

---
updated-dependencies:
- dependency-name: del
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -30,7 +30,7 @@
     "bootstrap": "4.0.0-alpha.6",
     "browser-sync": "^2.29.3",
     "css-loader": "^5.2.7",
-    "del": "^6.1.1",
+    "del": "^7.1.0",
     "exports-loader": "^0.7.0",
     "file-loader": "^6.2.0",
     "gulp": "^4.0.2",