First v3 version

What's Changed

• API changes in v3 mode (#1087)
• Power spectrum emulators (#1094, #1102, #1103).
• Improvements to matter density profiles by @hsinfan1996 (#1096, #1093)
• LPT NL PT by @anicola in #1097
• Better treatment of halo model overdensity parameters (#1101, #1100)
• More and better treatment of baryonic effect models (#1108, #1110, #1113)
• Allow sigma8 as an input when using CAMB for nonlinear power spectra by @tilmantroester in #1106
• Bocquet 2020 mass function emulator by @damonge in #1115
• Container for MG params by @tilmantroester in #1119
• Improved documentation (#1116)

New Contributors

• @matteozennaro made their first contribution in #1094
• @anicola made their first contribution in #1097

Full Changelog: v2.8.0...v3.0.0