Update README.md

Author: jeffmaki

README.md

@@ -23,7 +23,7 @@
 
 ```docker-compose -f docker-compose.build.yml --env-file XXX.env build```
 
-```docker-compose -f docker-compose.build.yml --env-file XXX.env push```
+```docker-compose --env-file XXX.env push```
 
 Replace XXX.env with the environment definition file of the environment for which you want to build an image. This can be overridden when running (see below).