v0.2.1

• Make better use of normalization in OPES
• Add top. charge density kernels

What's Changed

• V1.0 by @GianlucaFuwa in #8
• opes derivative fix part 2 by @GianlucaFuwa in #9
• Use OPES's simpler reweighting scheme by @GianlucaFuwa in #10
• v0.2.1 by @GianlucaFuwa in #11

Full Changelog: v0.2.0...v0.2.1