bash_zsh_instructions
Update install instructions for Bash and Zsh
* Synchronize README.md with `pyenv init` * Add a Bash installation option (only to README) that would still allow automated install if ~/.profile sources ~/.bashrc * Add a ~/.bash_profile note * Concatenate shims activation into installation for brevity (Pyenv can't be used meaningfully without shims anyway) Otherwise, we'd need to duplicate all the ~/.profile shenanigans in both sections