update version in phmap_config.h
update version in CITATION.cff
update version in comment on top of CMakeLists.txt
update all versions # in doc/new_release.md.
git commit
git push
create the new release on github (tag v2.0.0 - use semantic versioning)
download the tar.gz from github, and use sha256sum parallel-hashmap-2.0.0.tar.gz on linux to get the sha256

conan

use forked repo
sync fork in github
git checkout conan-io:master
git checkout -b phmap_2.0.0
update: recipes/parallel-hashmap/all/conandata.yml and recipes/parallel-hashmap/config.yml
sudo pip install conan -U
cd recipes/parallel-hashmap/all
does not work conan create conanfile.py parallel-hashmap/2.0.0@ -pr:b=default -pr:h=default no version?? update version in recipes/parallel-hashmap/all/conanfile.py
git diff
git commit -am "[parallel-hashmap] Bump version to 2.0.0"
git push origin phmap_2.0.0
create PR like this

vcpkg

use forked repo
sync fork in github
git checkout -b phmap_2.0.0
update ports/parallel-hashmap/portfile.cmake (the sha512) and ports/parallel-hashmap/vcpkg.json (the version #)
commit
./bootstrap-vcpkg.sh
vcpkg x-add-version --all --overwrite-version ## (or ./vcpkg.exe --no-dry-run upgrade )
commit
push
create PR