cache vendor directory

while #46 borrowed psalm's use of `composer clear cache` in 8250289, it didn't also include the vendor directory caching.
psalm · Feb 7, 2020 · 23c57a0 · 23c57a0
1 parent a54c65c
commit 23c57a0
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -27,6 +27,10 @@ env:
     global:
         - DEFAULT_COMPOSER_FLAGS="--no-interaction --no-suggest"
 
+cache:
+  directories:
+    - ./vendor
+
 allow_failures:
     - php: 7.1
       env: DEPS="dev"