Remove pledgie.com (#2446)

README.md

@@ -230,8 +230,6 @@ The [ASF](https://github.com/Alamofire/Foundation#members) is looking to raise m
 
 The community adoption of the ASF libraries has been amazing. We are greatly humbled by your enthusiasm around the projects, and want to continue to do everything we can to move the needle forward. With your continued support, the ASF will be able to improve its reach and also provide better legal safety for the core members. If you use any of our libraries for work, see if your employers would be interested in donating. Our initial goal is to raise $1000 to get all our legal ducks in a row and kickstart this campaign. Any amount you can donate today to help us reach our goal would be greatly appreciated.
 
-<a href='https://pledgie.com/campaigns/31474'><img alt='Click here to lend your support to: Alamofire Software Foundation and make a donation at pledgie.com !' src='https://pledgie.com/campaigns/31474.png?skin_name=chrome' border='0' ></a>
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 ## License
 
 Alamofire is released under the MIT license. [See LICENSE](https://github.com/Alamofire/Alamofire/blob/master/LICENSE) for details.