docs(readme): fix repo owner in badge and usage example (#43)

Author: ludnic

README.md

@@ -1,6 +1,6 @@
 # Setup Fortran
 
-[![Test](https://github.com/awvwgk/setup-fortran/actions/workflows/test.yml/badge.svg)](https://github.com/awvwgk/setup-fortran/actions/workflows/test.yml)
+[![Test](https://github.com/fortran-lang/setup-fortran/actions/workflows/test.yml/badge.svg)](https://github.com/fortran-lang/setup-fortran/actions/workflows/test.yml)
 [![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)
 [![GitHub tag](https://img.shields.io/github/tag/fortran-lang/setup-fortran.svg)](https://github.com/fortran-lang/setup-fortran/tags/latest)
 
@@ -44,7 +44,7 @@ jobs:
             toolchain: {compiler: intel-classic, version: '2021.10'}
 
     steps:
-      - uses: awvwgk/setup-fortran@v1
+      - uses: fortran-lang/setup-fortran@v1
         id: setup-fortran
         with:
           compiler: ${{ matrix.toolchain.compiler }}