Upgrade PHP to v7.1.4

Author: rtucek

Dockerfile

@@ -14,7 +14,7 @@ LABEL \
 
 ENV \
     NGINX_VERSION=1.11.11 \
-    PHP_VERSION=7.1.3 \
+    PHP_VERSION=7.1.4 \
     XDEBUG_VERSION=2.5.0 \
     VERSION=${VERSION}