update rakefile

rework examples

examples/obs/Gemfile

@@ -2,8 +2,4 @@
 
 source "https://rubygems.org"
 
-gem "voicemeeter", path: "../.."
-
 gem "obsws", "~> 0.1.3"
-
-gem "pathname", "~> 0.2.1"

examples/obs/main.rb

@@ -1,4 +1,4 @@
-require "voicemeeter"
+require_relative "../../lib/voicemeeter"
 require "obsws"
 require "yaml"
 require "pathname"
@@ -59,7 +59,7 @@ def conn_from_yml
 end
 
 
-if $0 == __FILE__
+if $PROGRAM_NAME == __FILE__
   Voicemeeter::Remote.new(:potato).run do |vm|
     Main.new(vm, **conn_from_yml).run
   end