Bump mkdirp from 0.5.5 to 1.0.4 (#48)

Bumps [mkdirp](https://github.com/isaacs/node-mkdirp) from 0.5.5 to 1.0.4.
- [Release notes](https://github.com/isaacs/node-mkdirp/releases)
- [Changelog](https://github.com/isaacs/node-mkdirp/blob/master/CHANGELOG.md)
- [Commits](isaacs/node-mkdirp@v0.5.5...v1.0.4)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -36,7 +36,7 @@
  "chai": "^4.2.0",
  "jsdoc": "^3.6.4",
  "minami": "^1.1.0",
- "mkdirp": "^0.5.5",
+ "mkdirp": "^1.0.4",
  "mocha": "^6.2.3",
  "rimraf": "^2.7.1"
  },