Updated latest bigtable client version in readme (#2167)
Updated latest bigtable client version in readme (#2167)

## What this PR contains
- Updated latest bigtable client version in readme
- Added artifact names under `code` format
- Updated client repo table with latest information
sduskis/cloud-bigtable-client,sduskis/cloud-bigtable-client,googleapis/java-bigtable-hbase,googleapis/java-bigtable-hbase,googleapis/java-bigtable-hbase