Bump prettier from 1.19.1 to 2.5.1 (#560)

Bumps [prettier](https://github.com/prettier/prettier) from 1.19.1 to 2.5.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@1.19.1...2.5.1)

---
updated-dependencies:
- dependency-name: prettier
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

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

Author: dependabot[bot]

package-lock.json

@@ -105,7 +105,7 @@
 		"lint-staged": "^11.0.0",
 		"mocha": "^6.2.3",
 		"nyc": "^15.1.0",
-		"prettier": "^1.17.0",
+		"prettier": "^2.5.1",
 		"rollup": "^2.36.2",
 		"rollup-plugin-terser": "^7.0.2",
 		"sinon": "^12.0.1",