upgrade base image version

php-fpm/Dockerfile

@@ -14,7 +14,7 @@
 
 ARG LARADOCK_PHP_VERSION
 
-FROM laradock/php-fpm:2.6.2-${LARADOCK_PHP_VERSION}
+FROM laradock/php-fpm:2.7-${LARADOCK_PHP_VERSION}
 
 LABEL maintainer="Mahmoud Zalt <mahmoud@zalt.me>"