Merge pull request #34 from genedna/master

tar: remove superfluous param

Author: jonboulle

SPEC.md

@@ -69,7 +69,7 @@ The image may be optionally compressed with gzip, bzip2 or xz.
 After compression images may also be encrypted with AES symmetric encryption.
 
 ```
-tar cvvf reduce-worker.tar app rootfs
+tar cvf reduce-worker.tar app rootfs
 gpg --output reduce-worker.sig --detach-sig reduce-worker.tar
 gzip reduce-worker.tar -c > reduce-worker.aci
 ```