Update .travis.yml to PHP 7.4 stable

jfcherng · jfcherng · commit 10676799da10 · 2019-12-15T02:36:06.000+08:00
Signed-off-by: Jack Cherng &lt;jfcherng@gmail.com&gt;
diff --git a/.travis.yml b/.travis.yml
@@ -4,7 +4,7 @@ php:
   - 7.1
   - 7.2
   - 7.3
-  - 7.4snapshot
+  - 7.4
 
 cache:
   directories:
