little task for Elixir Mix that updates your 'VERSION' file, and make commit, if its a git repository
thats for mix release
add
{:bump_version, git: "https://github.com/skorobogatko/bump_version.git", branch: "master"}
to your mix.exs file in deps() section
then in shell
mix deps.get bump_version
mix deps.compile
mix bump_version
mix bump_version patch
mix bump_version minor
mix bump_version major
mix help bump_version