Allow offline enviroment

[wangsrGit119]

https://github.com/stanfordnlp/stanza/blob/539760cdc5a903de23895db46e5d7c2e1f8f251b/stanza/pipeline/core.py#L207

if (download_method is DownloadMethod.DOWNLOAD_RESOURCES or
            (download_method is DownloadMethod.REUSE_RESOURCES and not os.path.exists(os.path.join(self.dir, "resources.json")))):
            logger.info("Checking for updates to resources.json in case models have been updated.  Note: this behavior can be turned off with download_method=None or download_method=DownloadMethod.REUSE_RESOURCES")
            download_resources_json(self.dir,
                                    resources_url=resources_url,
                                    resources_branch=resources_branch,
                                    resources_version=resources_version,
                                    resources_filepath=resources_filepath,
                                    proxies=proxies)

[KoljaB]

Thank you!