Releasing E Cell4

GitHub

1. update version in https://github.com/ecell/ecell4_base/blob/master/setup.py
2. New release https://github.com/ecell/ecell4_base/releases
3. Write release note

PyPI

1. update https://github.com/ecell/manylinux-dockerimage/blob/master/Dockerfile with the latest conda-forge cmake and gsl
2. update https://github.com/ecell/ecell4_base/blob/master/.circleci/config.yml with the latest conda-forge boost
3. check the manylinux wheel in circleci artifact
4. twine upload the manylinux wheel

conda-forge

1. send pull request to https://github.com/conda-forge/ecell4_base-feedstock/blob/master/recipe/meta.yaml