Recognize pyproject.toml when showing pyenv section (spaceship-prompt…

…#550)

pyproject.toml specifies what build dependencies project have in order to
execute their chosen build system. Tools like Poetry[1] use the file to store
the build instructions and requirements. See PEP-518[2] for more

[1]: https://github.com/sdispater/poetry
[2]: https://www.python.org/dev/peps/pep-0518/#file-format

sections/pyenv.zsh

@@ -23,7 +23,7 @@ spaceship_pyenv() {
   [[ $SPACESHIP_PYENV_SHOW == false ]] && return
 
   # Show pyenv python version only for Python-specific folders
-  [[ -f requirements.txt ]] || [[ -n *.py(#qN^/) ]] || return
+  [[ -f requirements.txt || -f pyproject.toml || -n *.py(#qN^/) ]] || return
 
   spaceship::exists pyenv || return # Do nothing if pyenv is not installed