Adjust minimum versions

We now require the latest discordrb, alongside Ruby 3.0 and above.

README.md

@@ -7,8 +7,8 @@ However, feel free to use it if you want, just don't be surprised when it doesn'
 # Creating a bot with Commandrb
 
 ## Requirements
-- Ruby 2.4+ (2.6+ is recommended)
-- [discordrb](https://github.com/discordrb/discordrb) 3.0+
+- Ruby 3.0+
+- [discordrb](https://github.com/shardlab/discordrb) 3.3+
 
 ## Install
 You can do this by one of two ways:
@@ -37,11 +37,9 @@ cbot = CommandrbBot.new(
     }
 )
 
-cbot.add_command(:ping, 
-  code: proc { |event,args|
-    event.respond('Pong!')
-  }
-)
+cbot.add_command(:ping) do |event, args|
+  event.respond('Pong!')
+end
 
 cbot.bot.run
 ```

commandrb.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.homepage =
     'https://github.com/Yuuki-Discord/commandrb'
   s.license = 'MIT'
-  s.add_runtime_dependency 'discordrb', '~> 3.1', '>= 3.1.0'
+  s.add_runtime_dependency 'discordrb', '~> 3.3', '>= 3.3.0'
   s.metadata = {
     'rubygems_mfa_required' => 'true'
   }