Merge pull request #7 from Shashwatsh/master

Update README.md; fixed a typo

Author: lucab

README.md

@@ -20,7 +20,7 @@ Commit any changes to `acbuild.sh`, and push them.
 
 Add a signed tag:
 
-    $ GIT_COMMITTER_NAME="CoreOS Application Signing Key" GIT_COMMITTER_EMAIL="security@coreos.com" git tag -u $RKTSUBKEYID'!' -s v1.0.0 -m "rkt-builder v1.0.0"`
+    $ GIT_COMMITTER_NAME="CoreOS Application Signing Key" GIT_COMMITTER_EMAIL="security@coreos.com" git tag -u $RKTSUBKEYID'!' -s v1.2.0 -m "rkt-builder v1.2.0"`
 
 Push the tag to GitHub:
 
@@ -34,7 +34,7 @@ Push the tag to GitHub:
         --volume src-dir,kind=host,source="$(pwd)" \
         --volume build-dir,kind=host,source="$(pwd)/release-build" \
         --interactive \
-        coreos.com/rkt/builder:v1.0.0
+        coreos.com/rkt/builder:1.2.0
 
 ## Overview