Update .travis.yml

Kentzo · web-flow · commit 36bef7b82d7d · 2021-01-31T17:40:12.000-05:00
Add zlib to macOS dependencies.
diff --git a/.travis.yml b/.travis.yml
@@ -19,6 +19,7 @@ addons:
       - openssl
       - readline
       - xz
+      - zlib
     update: true
 
 jobs:
