Update C extension examples in README.md

ruby-c-extension/sketchup-taskbarlist/README.md

@@ -6,24 +6,35 @@ that was introduced to Windows 7.
 It is advised to read up on the interface for how to use it:
 https://docs.microsoft.com/en-gb/windows/win32/api/shobjidl_core/nn-shobjidl_core-itaskbarlist3
 
-## Visual Studio 2013
+## Visual Studio 2019
 
 The Ruby C Extension was created with Visual Studio 2019:
 https://visualstudio.microsoft.com/downloads/
 
-NOTE: The Ruby `config.h` had to be modified because it was originally intended
-for Visual Studio 2010.
-
-## Example
+## Examples
 
 ```ruby
 require 'sketchup.rb'
-require 'taskbar_progress.rb'
+require 'testup/taskbar_progress.rb'
 
 model = Sketchup.active_model
 entities = model.active_entities
 
-TaskbarProgress.new.each(entities.to_a) { |entity|
-  entity.erase!
+TestUp::TaskbarProgress.new.each(entities.to_a) { |entity|
+  entity.erase! if entity.valid?
+}
+```
+
+```ruby
+x = [1, 2, 3, 4, 5, 6]
+progress = TestUp::TaskbarProgress.new
+progress.each(x) { |entity|
+  p x
+  sleep(0.5)
 }
 ```
+
+```ruby
+progress = TestUp::TaskbarProgress.new
+progress.set_state(TestUp::TaskbarProgress::TBPF_INDETERMINATE)
+```