Merge pull request #44 from ipsq/patch-1

Fixed typo

Author: fermayo

README.md

@@ -112,7 +112,7 @@ And then run your builds as above appending `--volumes-from builder_cache` to th
 
 ## Adding credentials via .dockercfg
 
-If your tests depend on private images, you can pass their credentials either by mounting your local `.dockercfg` file inside the container appending `-v $HOME/.dockercfg:/.dockercfg:r`, or by providing the contents of this file via an environment variable called `$DOCKERCFG`: `-e DOCKERCFG=$(cat $HOME/.dockercfg)`
+If your tests depend on private images, you can pass their credentials either by mounting your local `.dockercfg` file inside the container appending `-v $HOME/.dockercfg:/.dockercfg:ro`, or by providing the contents of this file via an environment variable called `$DOCKERCFG`: `-e DOCKERCFG=$(cat $HOME/.dockercfg)`
 
 ## Using the host docker daemon instead of docker-in-docker