message: readme: say GNU/Linux
diff: @@ -77,7 +77,7 @@ sudo pip3 install elle/drake/requirements.txt # Install Drake dependencies.
  Change directory to `elle/_build/<architecture>` where you can find a generic Drake [configuration script](https://github.com/infinit/drake#basic-structures-of-a-drakefile-and-a-drake-script).
  -#### Linux
  +#### GNU/Linux
  ```bash
  @@ -100,7 +100,7 @@ Because Elle was designed to be modular, you can build specific parts of Elle by
  ./drake //protocol/build -j 2 # To build the libprotocol and its dependencies.
  ./drake //...
  ```
  -It will result on `<module>/lib/lib<module>.so` and its dependencies on Linux, `<module>/lib/lib<module>.dylib` on macOS, ...
  +It will result on `<module>/lib/lib<module>.so` and its dependencies on GNU/Linux, `<module>/lib/lib<module>.dylib` on macOS, ...
  ### Dependencies
  