Brew upgrade does not install, only upgrade...

edomora97 · edomora97 · commit 88b5e3a14764 · 2018-05-19T11:52:49.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -84,7 +84,8 @@ matrix:
 
     - os: osx
       before_install:
-        - brew upgrade python wget cmake rust
+        - brew upgrade python wget cmake
+        - brew install rust
 
 
 cache:
