Fix YAML syntax

Author: szepeviktor

.travis.yml

@@ -18,7 +18,7 @@ php:
     - "8.0"
     - "7.4"
     - "7.3"
-    - "7.2
+    - "7.2"
     - "7.1"
 
 jobs:
@@ -29,7 +29,7 @@ before_install:
 
 install:
     - "phpize"
-    - "CFLAGS='-Wall -Werror' ./configure"
+    - "CFLAGS=\"-Wall -Werror\" ./configure"
     - "make"
 
 script: