Merge pull request #4 from lonelyplanet/incoming-url-config

Sending message fails if config.incoming_url is not set

lib/lita/adapters/slack.rb

@@ -51,7 +51,7 @@ def prepare_payload(target, strings)
 			def http_post(payload)
 				res = Faraday.post do |req|
 					log.debug "Slack::http_post sending payload to #{incoming_url}; length: #{payload.to_json.size}"
-					req.url config.incoming_url, :token => config.incoming_token
+					req.url incoming_url, :token => config.incoming_token
 					req.headers['Content-Type'] = 'application/json'
 					req.body = payload.to_json
 				end