Install Fortran via Homebrew

Author: IvanUkhov

.travis.yml

@@ -7,16 +7,16 @@ os:
 rust:
   - stable
 
-before_install:
-  - curl https://blas-lapack-rs.github.io/travis/fortran.sh | bash
-
 script:
   - cargo test -vv
 
 addons:
   apt:
     packages:
       - gfortran
+  homebrew:
+    packages:
+      - gcc@9
 
 notifications:
   email: false