remove useless composer command

mikaelcom · mikaelcom · commit a1dff642751f · 2019-01-08T20:12:50.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -11,9 +11,6 @@ matrix:
     - php: 7.1
     - php: 7.2
 
-before_install:
-    - composer self-update
-
 install:
     - composer install
 
