add renderer for lint

lib/travis/api/v3/queries/lint.rb

@@ -7,7 +7,8 @@ module Travis::API::V3
       content  = params[:content] || request.body.read
       parsed   = Travis::Yaml.parse(content)
       warnings = parsed.nested_warnings.map { |k, m| { key: k, message: m } }
-      { lint: { warnings: warnings } }.to_json
+      payload = { lint: { warnings: warnings } }.to_json
+      payload
     end
   end
 end

lib/travis/api/v3/renderer/lint.rb

@@ -0,0 +1,9 @@
+module Travis::API::V3
+  module Renderer::Lint
+    extend self
+
+    def render(payload)
+      { Renderer.render_value(payload) }
+    end
+  end
+end