Support Rubocop 1.8.1 #271

There is a recently released branch for 1.8.1 but in the Codeclimate UI I see the following:

Channel rubocop-1-8-1 not found for rubocop, available channels: ["stable", "cache-support", "rubocop-0-42", "rubocop-0-46", "rubocop-0-48", "rubocop-0-49", "rubocop-0-50", "rubocop-0-51", "rubocop-0-52", "rubocop-0-54", "rubocop-0-55", "rubocop-0-56", "rubocop-0-57", "rubocop-0-58", "rubocop-0-59", "rubocop-0-60", "rubocop-0-61", "rubocop-0-62", "rubocop-0-63", "rubocop-0-64", "rubocop-0-66", "rubocop-0-65", "rubocop-0-67", "rubocop-0-68", "rubocop-0-69", "rubocop-0-70", "rubocop-0-71", "rubocop-0-72", "rubocop-0-73", "rubocop-0-74", "rubocop-0-75", "rubocop-0-76", "rubocop-0-76-airbnb", "rubocop-0-77", "rubocop-0-78", "rubocop-0-79", "rubocop-0-80", "rubocop-0-81", "rubocop-0-82", "rubocop-0-83", "rubocop-0-84", "rubocop-0-85", "rubocop-0-86", "rubocop-0-87", "rubocop-0-88", "rubocop-0-89", "rubocop-0-90", "rubocop-0-92", "rubocop-1-70"]

Does something need to be done to "publish" the channel?