Prepare 3.2.3 release (OpenAPITools#935)

* update release version, disabled ensure up to date script

* update release table

* update stable version to 3.2.3

* update samples/meta-codegen/lib/pom.xml and release_version_update.sh

3.2.2 release (OpenAPITools#869)

* run bin/utils/release_version_update.sh

* comment out ensure-up-to-date script

* run bin/utils/release_version_update_docs.sh

* fix link to lc3

3.2.1 release (OpenAPITools#807)

* 3.2.1 release

* roll back incorrect change to link

* update doc

* update 3.1.2 release

* Fix version table

3.2.0 release (OpenAPITools#744)

Release 3.1.2 (OpenAPITools#647)

Release 3.1.1 (OpenAPITools#588)

3.1.0 release (OpenAPITools#486)

* 3.1.0 release

* Comment ./bin/utils/ensure-up-to-date

Release 3.0.3 (OpenAPITools#406)

* Remove the SNAPSHOT version

bin/utils/release_version_update.sh 3.0.3-SNAPSHOT 3.0.3

* Disable ensure-up-to-date temporarily

Prepare release 3.0.2 (OpenAPITools#337)

Prepare 3.0.1 release (OpenAPITools#280)

* add new bash script for release version update

* update version using the bash script

* Fix shippable build

Modify `artifactId` of `CI/pom.xml.shippable` to be `openapi-generator-shippable-pom`

* Comment ensure-up-to-date

* add shippable to the release script

* Updates README based on new release changes (OpenAPITools#271)

The release management changes moved from maven-publish (newer plugin)
to maven (older plugin, only one that works currently with signing).
This updates docs in the samples/local-spec project with current
directions.

Also:

* Includes sonatype releases/snapshots on repo lookup
* Adds openApiGeneratorVersion property