Add Select::onChange() method

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d073b0e) to head (fcdffd7).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #229   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       806       807    +1     
===========================================
  Files             86        86           
  Lines           2213      2217    +4     
===========================================
+ Hits            2213      2217    +4     

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[samdark]

I don't think we should add it:

1. It's not a good practice to use such attributes with inline JavaScript.
2. There are tons of such events for every tag. Are we going to add every possible event?

[vjik]

1. I agree, this HTML attribute is rare used. However, I have needed it a few times, and make it with this method more convient than attribute() method usage.

2. Step by step, when they are needed in practice.