Initializes sentry.io error logging for this session

def init_sentry(self,):
        """ Initializes sentry.io error logging for this session """
        if not self.use_sentry:
            return

        sentry_config = self.keychain.get_service("sentry")

        tags = {
            "repo": self.repo_name,
            "branch": self.repo_branch,
            "commit": self.repo_commit,
            "cci version": cumulusci.__version__,
        }
        tags.update(self.config.get("sentry_tags", {}))

        env = self.config.get("sentry_environment", "CumulusCI CLI")

        self.sentry = raven.Client(
            dsn=sentry_config.dsn,
            environment=env,
            tags=tags,
            processors=("raven.processors.SanitizePasswordsProcessor",),
        )