Axterdb

What's Changed
- Added `.delete_table()` method

**Full Changelog**: https://github.com/AxterDB/wrapper/compare/v1.4...v1.5

What's Changed
- Added `latency` variable in `Client` and `AdminClient` (Shows approx latency w/ the database)
- Removed a debug statement in `.get()`
- Added an error when there is no column found in `.get()`

**Full Changelog**: https://github.com/AxterDB/wrapper/compare/v1.3...v1.4

What's Changed
- Fixed a bug with insert function not having correct headers
- Added `.delete()` method