Adds 'v' prefix to version tag (#305)

Signed-off-by: Sean Sundberg <seansund@us.ibm.com>

Author: Sean Sundberg

.github/release-drafter.yaml

@@ -1,5 +1,5 @@
 name-template: '$RESOLVED_VERSION'
-tag-template: '$RESOLVED_VERSION'
+tag-template: 'v$RESOLVED_VERSION'
 change-template: '- $TITLE @$AUTHOR (#$NUMBER)'
 categories:
   - title: 'Features'