README: minor typo cp

README.md

@@ -89,7 +89,7 @@ git clone https://github.com/kamailio/kamailio
   * copy desired Dockerfile in the current folder
 
 ```
-cp kamailio-tests/docker/Dockerfile
+cp kamailio-tests/docker/Dockerfile .
 ```
 
   * build the Docker image
@@ -134,4 +134,4 @@ Contributions are more than welcome, recommended way is to do pull requests.
 
 Mailing list:
 
-  * <sr-users [at] lists.kamailio.org>
+  * <sr-users [at] lists.kamailio.org>