Fix the go version in the readme.#16

mayurkale22 merged 1 commit intocloudspannerecosystem:maincloudspannerecosystem/spanner-cassandra-schema-tool:mainfrom

JasonHuang9527:hsuanhs/fix_readmeJasonHuang9527/spanner-cassandra-schema-tool:hsuanhs/fix_readmeCopy head branch name to clipboard