Changes:
  - docs: Add v0.6.1 release notes (#1357)
  - test: Test lower bounds of dependencies (#1355)
  - refactor: Use torch APIs for ravel, tile, and outer tensorlib methods (#1354)
  - ci: Run docs CI on push events only from PR merges (#1353)
  - docs: Add use citation for Artificial Proto-Modelling paper (#1347)
  - fix: Retain continuous approximation of Poisson in torch v1.8.0 (#1351)
  - docs: Add and apply blacken-docs as a pre-commit hook (#1345)
  - docs: Clarify and harmonize docstrings for fit parameters (#1344)
  - docs: Add record for published ATLAS likelihoods from November 2020 (#1343)
  - docs: Add use citation for wino and higgsino dark matter at  muon collider (#1340)
  - feat: Solver options for scipy (#1337)
  - docs: Drop modifierclass and improve autosummary (#1338)
  - chore: Update to nbQA 0.5.9 in pre-commit (#1333)
  - docs: Update CONTRIBUTING.md to disincentivize 'drive by PRs' (#1332)
  - docs: Fix typo in Using Calculator learn notebook (#1331)
  - docs: Update ATLAS 3G tt 2L citation (#1330)
  - chore: Apply minor code quality revisions (#1325)
  - docs: Add use citations for QCD instantons and charged lepton flavor violation (#1329)
  - docs: Add CPython implementation and Python 3 only metadata (#1324)
  - docs: Update Zenodo BibTeX author field in citation in docs (#1323)
  - docs: Use more flexible BibTeX syntax for Zenodo DOI (#1322)
  - docs: Add dropping of Python 3.6 support to v0.6.0 release notes (#1317)
  - chore: Update codemeta to include v0.6.0 software requirements (#1318)
  - docs: Correct typos in v0.6.0 release notes (#1316)