Sacc

What's Changed
* Add has_tracer method to sacc.Sacc and test it by marcpaterno in https://github.com/LSSTDESC/sacc/pull/98
* Update README.md by elisachisari in https://github.com/LSSTDESC/sacc/pull/100

New Contributors
* elisachisari made their first contribution in https://github.com/LSSTDESC/sacc/pull/100

**Full Changelog**: https://github.com/LSSTDESC/sacc/compare/v0.12...v0.13

**Full Changelog**: https://github.com/LSSTDESC/sacc/compare/v0.9...v0.12

**Full Changelog**: https://github.com/LSSTDESC/sacc/compare/v0.9...v0.11

What's Changed
* Issue/93/revert to radius tracer by combet in https://github.com/LSSTDESC/sacc/pull/94


**Full Changelog**: https://github.com/LSSTDESC/sacc/compare/v0.9...v0.10

What's Changed
* New approach to store cluster counts, mass, WL profile information in sacc by combet in https://github.com/LSSTDESC/sacc/pull/92


**Full Changelog**: https://github.com/LSSTDESC/sacc/compare/v0.8.1...v0.9

What's Changed
* Always internally store and compare tracer types in lower case by joezuntz in https://github.com/LSSTDESC/sacc/pull/90

This fixes a change caused in the API in v0.8 - called to add_tracer can now use lower case again.

**Full Changelog**: https://github.com/LSSTDESC/sacc/compare/v0.8...v0.8.1