travis: Cache apt

tony · tony · commit a3c3522811dc · 2019-12-24T15:58:11.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -30,6 +30,7 @@ matrix:
   - env: TMUX_VERSION=master
 cache:
   - pip
+  - apt
   - directories:
     - ~/source
     - ~/build
