Remove nyholm/psr7 from require-dev (#928)

Nyholm · web-flow · commit 7feb507d1ce7 · 2019-01-05T19:19:45.000+01:00
* Remove nyholm/psr7 from require-dev

* cs
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: php
 sudo: false
 
-php: 7.0
+php: 7.2
 
 install:
   - composer update --prefer-stable --prefer-dist
