fix rubocop

Author: jcat4

lib/mcp/client/http.rb

@@ -80,7 +80,8 @@ def require_faraday!
         require "faraday"
       rescue LoadError
         raise LoadError, "The 'faraday' gem is required to use the MCP client HTTP transport. " \
-          "Add it to your Gemfile: gem 'faraday', '>= 2.0'" \ "See https://rubygems.org/gems/faraday for more details."
+          "Add it to your Gemfile: gem 'faraday', '>= 2.0'" \
+          "See https://rubygems.org/gems/faraday for more details."
       end
     end
   end