Version bump for tedious

SQL Browser operations in `tedious` had a hard-coded 2 second timeout. Now that it's fixed (see https://github.com/pekim/tedious/pull/196) and released as `v1.5.3`, I'd like to pull it into `mssql`.
Merge pull request #86 from DullReferenceException/tedious-version-pr

Version bump for tedious