tests: fixed php version

mitulgolakiya · mitulgolakiya · commit 756c1a98785f · 2020-09-13T11:47:53.000+05:30
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: php
 php:
-  - '7.2'
   - '7.3'
+  - '7.4'
 sudo: false
 cache:
   directories:
