Fix error formatting

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    omniai (1.6.2)
+    omniai (1.6.3)
       event_stream_parser
       http
       zeitwerk

lib/omniai.rb

@@ -17,12 +17,18 @@ class Error < StandardError; end
 
   # An error that wraps an HTTP::Response for non-OK requests.
   class HTTPError < Error
+    # @return [HTTP::Response]
     attr_accessor :response
 
     # @param response [HTTP::Response]
     def initialize(response)
-      super("status=#{response.status.inspect} headers=#{response.headers.inspect} body=#{response.body}")
+      super("status=#{response.status} body=#{response.body}")
+
       @response = response
     end
+
+    def inspect
+      "#<#{self.class} status=#{@response.status} body=#{@response.body}>"
+    end
   end
 end

lib/omniai/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module OmniAI
-  VERSION = '1.6.2'
+  VERSION = '1.6.3'
 end