Update composer before running install steps

alcaeus · alcaeus · commit d45cc6addc3c · 2018-12-21T07:28:53.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,9 @@ php:
   - 7.3
   - nightly
 
+before_install:
+  - composer self-update
+
 install:
   - composer install --dev
 
