forgot shellcheck

ccope · ccope · commit 5597013b5984 · 2021-08-28T00:18:46.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,6 +8,7 @@ cache:
 addons:
   apt:
     packages:
+    - shellcheck
     - valgrind
     - gcc
     - clang
