Bring back width, Github doesn't like it

Author: vipulnsward

README.md

@@ -118,4 +118,4 @@ MailInterceptor::Interceptor.new({ env: MyEnv.new,
 ```
 
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-<a href='http://BigBinary.com'><img src="https://s3.amazonaws.com/bigbinary-media/horizontal/logo_blue.png"/></a>
+<a href='http://BigBinary.com'><img src="https://s3.amazonaws.com/bigbinary-media/horizontal/logo_blue.png" width="200px"/></a>