fixed logo in readme

Author: jawnothin

README.md

@@ -100,5 +100,4 @@ php-http-client is guided and supported by the SendGrid [Developer Experience Te
 
 php-http-client is maintained and funded by SendGrid, Inc. The names and logos for php-http-client are trademarks of SendGrid, Inc.
 
-![SendGrid Logo]
-(https://uiux.s3.amazonaws.com/2016-logos/email-logo%402x.png)
+![SendGrid Logo](https://uiux.s3.amazonaws.com/2016-logos/email-logo%402x.png)