Fix the Travis build with multiple recipes

stof · stof · commit 80b81678add6 · 2018-12-08T12:59:33.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -23,4 +23,4 @@ install:
     - cd flex
 
 script:
-    - composer req "${PACKAGES}"
+    - composer req $(echo $PACKAGES)
