Tweak travis and appveyor for Symfony 4

nicolas-grekas · nicolas-grekas · commit 6b7fd49c53f2 · 2017-05-18T15:50:33.000+02:00
diff --git a/composer.json b/composer.json
@@ -20,7 +20,7 @@
         "symfony/polyfill-mbstring": "~1.0"
     },
     "require-dev": {
-        "symfony/css-selector": "~2.8|~3.0|~4.0"
+        "symfony/css-selector": "~3.4|~4.0"
     },
     "suggest": {
         "symfony/css-selector": ""
