Bump gitbook from 3.2.2 to 3.2.3

Bumps [gitbook](https://github.com/GitbookIO/gitbook) from 3.2.2 to 3.2.3.
- [Release notes](https://github.com/GitbookIO/gitbook/releases)
- [Changelog](https://github.com/GitbookIO/gitbook/blob/master/CHANGES.md)
- [Commits](https://github.com/GitbookIO/gitbook/commits)

---
updated-dependencies:
- dependency-name: gitbook
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -20,7 +20,7 @@
     "devDependencies": {
         "mocha": "3.4.2",
         "should": "13.2.3",
-        "gitbook": "3.2.2"
+        "gitbook": "3.2.3"
     },
     "scripts": {
         "test": "mocha --reporter spec --recursive --bail"