Updated gemfile and error logging

Updated gem file so threads worked again as well as silenced internal
500 errors and this is discord api error related and not actionable by
end users.

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'dicebag', git: 'https://github.com/Humblemonk/Dice-Bag.git', branch: 'master'
-gem 'discordrb', github: 'shardlab/discordrb', branch: 'main'
+gem 'discordrb', github: 'shardlab/discordrb', branch: 'threads'
 gem 'dotenv', '~> 2.5'
 gem 'rest-client', '~> 2.0', '>= 2.0.2'
 gem 'rubocop'

dice_maiden.rb

@@ -152,7 +152,7 @@
       else
         event.respond "#{@user} Rolls:\n#{@error_check_roll_set}Reason: `Simplified roll due to character limit`"
       end
-    elsif (e.message.include? "undefined method `join' for nil:NilClass") || (e.message.include? "The bot doesn't have the required permission to do this!") || (e.message.include? '500 Internal Server Error')
+    elsif (e.message.include? "undefined method `join' for nil:NilClass") || (e.message.include? "The bot doesn't have the required permission to do this!") || (e.message.include? '500: Internal Server Error')
       time = Time.now.getutc
       File.open('dice_rolls.log', 'a') { |f| f.puts "#{time} ERROR: #{e.message}" }
     else