update automated release workflow release.yml following pattern recently developed for FloPy release
add version.txt in project root and update setup.cfg and MANIFEST.in to reference it — if/when support for Python3.7 is dropped we can use importlib.metadata in modflow_devtools/__init__.py instead of hard-coding the version number
release.ymlfollowing pattern recently developed for FloPy releaseversion.txtin project root and updatesetup.cfgandMANIFEST.into reference it — if/when support for Python3.7 is dropped we can useimportlib.metadatainmodflow_devtools/__init__.pyinstead of hard-coding the version numberscripts/update_version.pyscripts/pull_request_prepare.py->scripts/lint.pyREADME.mdwithpipinstallation instructionsDEVELOPER.mdCONTRIBUTING.md