Fixed PHP 7.4 testing on travis

Author: Toflar

.travis.yml

@@ -24,7 +24,7 @@ php:
     - 7.1
     - 7.2
     - 7.3
-    - 7.4-snapshot
+    - 7.4snapshot
     - nightly
 
 matrix:
@@ -45,7 +45,7 @@ matrix:
     allow_failures:
         - env: deps=beta
         - php: nightly
-        - php: 7.4-snapshot
+        - php: 7.4snapshot
 
 before_install:
     - phpenv config-rm xdebug.ini || echo "xdebug not available"