mention Intercom::ServiceConnectionError in Readme.md

Author: darragh

README.md

@@ -336,6 +336,7 @@ else rescue the more specific error subclass.
 Intercom::AuthenticationError
 Intercom::ServerError
 Intercom::ServiceUnavailableError
+Intercom::ServiceConnectionError
 Intercom::ResourceNotFound
 Intercom::BadRequestError
 Intercom::RateLimitExceeded

lib/intercom/errors.rb

@@ -20,9 +20,10 @@ class ServerError < IntercomError; end
   # Raised when we have bad gateway errors.
   class BadGatewayError < IntercomError; end
 
-  # Raised when we reach socket connect timeout
+  # Raised when we experience a socket read timeout
   class ServiceUnavailableError < IntercomError; end
 
+  # Raised when we experience socket connect timeout
   class ServiceConnectionError < IntercomError; end
 
   # Raised when requesting resources on behalf of a user that doesn't exist in your application on Intercom.