now passing pry instance as 3rd parameter to exception_handler proc

lib/pry.rb

@@ -51,7 +51,7 @@ class Pry
   end
 
   # Will only show the first line of the backtrace
-  DEFAULT_EXCEPTION_HANDLER = proc do |output, exception|
+  DEFAULT_EXCEPTION_HANDLER = proc do |output, exception, _|
     output.puts "#{exception.class}: #{exception.message}"
     output.puts "from #{exception.backtrace.first}"
   end

lib/pry/pry_instance.rb

@@ -254,7 +254,7 @@ class Pry
   # Output the result or pass to an exception handler (if result is an exception).
   def show_result(result)
     if last_result_is_exception?
-      exception_handler.call output, result
+      exception_handler.call output, result, self
     else
       print.call output, result
     end