Update Travis to enable watchOS 3.2 builds.
Update Travis to enable watchOS 3.2 builds.

richardPFisk/Alamofire,yimajo/Alamofire,easyui/Alamofire,antigp/Alamofire,iosheadhunter/Alamofire,richardPFisk/Alamofire,iosheadhunter/Alamofire,easyui/Alamofire,Alamofire/Alamofire,Alamofire/Alamofire,antigp/Alamofire,yimajo/Alamofire