[HOTFIX] :fire: Remove gradle caches/wrapper folders from list of source files. (#731)
[HOTFIX] :fire: Remove gradle caches/wrapper folders from list of source files. (#731)

On Jenkins machine: If `GRADLE_HOME` is configured to point to the directory with source code,
Jenkins CI is complaining about additional files. This fix puts gradle caches into Git ignore list.
mathemage/h2o-3,spennihana/h2o-3,mathemage/h2o-3,mathemage/h2o-3,h2oai/h2o-dev,mathemage/h2o-3,h2oai/h2o-dev,michalkurka/h2o-3,h2oai/h2o-3,h2oai/h2o-3,h2oai/h2o-dev,h2oai/h2o-3,mathemage/h2o-3,michalkurka/h2o-3,h2oai/h2o-dev,h2oai/h2o-3,spennihana/h2o-3,h2oai/h2o-3,spennihana/h2o-3,michalkurka/h2o-3,mathemage/h2o-3,h2oai/h2o-dev,michalkurka/h2o-3,h2oai/h2o-dev,h2oai/h2o-dev,michalkurka/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,spennihana/h2o-3,h2oai/h2o-3,spennihana/h2o-3,mathemage/h2o-3,spennihana/h2o-3,spennihana/h2o-3,h2oai/h2o-3