Use Composer v1 for PHAR compiler

ondrejmirtes · ondrejmirtes · commit 9e53d32e3706 · 2020-10-24T14:26:47.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -11,6 +11,7 @@ env:
 
 before_script:
   - if php --ri xdebug >/dev/null; then phpenv config-rm xdebug.ini; fi
+  - composer self-update --1
   - composer update --no-interaction
 
 jobs:
