symfony 4 has been released, remove stability=rc (#246)

dbu · Nyholm · commit 4c4e25d1812b · 2018-01-07T13:10:51.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -40,7 +40,7 @@ matrix:
         - php: 7.2
           env: DEPENDENCIES="dunglas/symfony-lock:^3"
         - php: 7.2
-          env: DEPENDENCIES="dunglas/symfony-lock:^4" STABILITY="rc"
+          env: DEPENDENCIES="dunglas/symfony-lock:^4"
 
           # Latest commit to master
         - php: 7.2
