Fix user regexp in changelog specs
Fix user regexp in changelog specs

For example, the "-" character is valid, but doesn't belong to `[[:alnum:]]`.

deivid-rodriguez/activeadmin,javierjulio/activeadmin,deivid-rodriguez/activeadmin,deivid-rodriguez/activeadmin,javierjulio/activeadmin,javierjulio/activeadmin,activeadmin/activeadmin,activeadmin/activeadmin,activeadmin/activeadmin