(maint) Document removal of Puppet 4

This commit documents:

* Dropping Puppet 4 support

* Removing experimental warning for the debug server

Author: glennsarti

README.md

@@ -6,7 +6,13 @@
 
 A ruby based implementation of a [Language Server](https://github.com/Microsoft/language-server-protocol) and [Debug Server](TODO) for the Puppet Language.
 
-**Note** - This project is experimental until 1.0 is released
+## Requirments
+
+* Puppet 5 or above
+
+* Ruby 2.4 or above
+
+**Note** that Puppet 4 (Ruby 2.1) is not supported
 
 ## Setting up editor services for development
 

lib/puppet-debugserver/puppet_debug_session.rb

@@ -132,12 +132,6 @@ def run_puppet
       cmd_args << '--noop' if @session_options['noop'] == true
       cmd_args.push(*@session_options['args']) unless @session_options['args'].nil?
 
-      # Send experimental warning
-      send_output_event(
-        'category' => 'console',
-        'output'   => "**************************************************\n* The Puppet debugger is an experimental feature *\n* Debug Server v#{PuppetEditorServices.version}                           *\n**************************************************\n\n"
-      )
-
       send_output_event(
         'category' => 'console',
         'output'   => 'puppet ' + cmd_args.join(' ') + "\n"