Ads

Removes trailing slash in API end points, which recently caused queries to broke (JohannesBuchner)

- Fixes 127
- Switches README from bit-rotten RST to markdown
- Minor bugs to fix build / PyPI upload process since 0.12.5

- Fixes 127
- Switch README to markdown to fix bit-rotted display on GitHub

What's Changed
* This will include the LICENSE file in the pypi tarball by guillochon in https://github.com/andycasey/ads/pull/95
* Article: use lazy load for print methods; closes 98 by vsudilov in https://github.com/andycasey/ads/pull/99
* Fixing docstrings in ExportResponse and ExportQuery by migueldvb in https://github.com/andycasey/ads/pull/100
* Rename assertRaisesRegexp to assertRaisesRegex by migueldvb in https://github.com/andycasey/ads/pull/101
* change from r.get_info() to r.limits by keatonb in https://github.com/andycasey/ads/pull/102
* Allow more recent versions of httpretty by moble in https://github.com/andycasey/ads/pull/105
* add additional export formats by r-xue in https://github.com/andycasey/ads/pull/109
* Search parameters already wrapped in parentheses no longer get wrapped in quotes by panasenco in https://github.com/andycasey/ads/pull/115
* changed syntax in cached_property for python >= 3.9.6 by CodeBBQ in https://github.com/andycasey/ads/pull/119
* Add Library class by steven-murray in https://github.com/andycasey/ads/pull/118
* Fix bug in cached_property by timothygebhard in https://github.com/andycasey/ads/pull/117

New Contributors
* guillochon made their first contribution in https://github.com/andycasey/ads/pull/95
* keatonb made their first contribution in https://github.com/andycasey/ads/pull/102
* moble made their first contribution in https://github.com/andycasey/ads/pull/105
* r-xue made their first contribution in https://github.com/andycasey/ads/pull/109
* panasenco made their first contribution in https://github.com/andycasey/ads/pull/115
* CodeBBQ made their first contribution in https://github.com/andycasey/ads/pull/119
* steven-murray made their first contribution in https://github.com/andycasey/ads/pull/118
* timothygebhard made their first contribution in https://github.com/andycasey/ads/pull/117

**Full Changelog**: https://github.com/andycasey/ads/compare/v0.12.3...0.12.4

This release has been spearheaded by Vladimir Sudilovsky (vsudilov) who has re-written the entire base code to be compatible with the new ADS API.