Update Astropy and add better doc build instructions

Changes

1 changed files (+1/-1)

• README.md
  • @@ -19,7 +19,7 @@ Great for unit conversions: https://speedcrunch.org/userguide/advanced.html
    ### Astropy - First, clone the submodule with `git submodule init && git submodule update --remote`. Then [build the documentation](https://github.com/astropy/astropy/blob/main/docs/install.rst#building-documentation). + First, clone the submodule with `git submodule init && git submodule update --remote`. Then [build the documentation](https://github.com/astropy/astropy/blob/main/docs/install.rst#building-documentation) with `tox -e build_docs`. ### Download web pages