chore(deps-dev): bump mocha from 6.2.2 to 7.0.0 (#4060)

* chore(deps-dev): bump mocha from 6.2.2 to 7.0.0

Bumps [mocha](https://github.com/mochajs/mocha) from 6.2.2 to 7.0.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.2.2...v7.0.0)

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

* chore(mocha): use new format of configuration

Co-authored-by: Sukka <isukkaw@gmail.com>

.mocharc.yml

@@ -0,0 +1,7 @@
+color: true
+reporter: spec
+ui: bdd
+full-trace: true
+exit: true
+require: 
+  - "chai/register-should"

package.json

@@ -76,7 +76,7 @@
     "hexo-renderer-marked": "^2.0.0",
     "husky": "^3.0.0",
     "lint-staged": "^9.1.0",
-    "mocha": "^6.0.0",
+    "mocha": "^7.0.0",
     "nyc": "^15.0.0",
     "rewire": "^4.0.1",
     "sinon": "^8.0.1"