removed version buildarg

Author: root

README.md

@@ -1,5 +1,5 @@
 # Builder Image
 
 ```
-docker build --build-arg channel=stable --build-arg version=current -t quay.io/quay/quay-builder-qemu-coreos:staging .
+docker build --build-arg channel=stable -t quay.io/quay/quay-builder-qemu-coreos:staging .
 ```