resistor-color-duo: Update exercise to 2.1.0

[pgaspar]

Problem specifications PR for 2.1.0: exercism/problem-specifications#1569

Mentor notes have already been merged here: exercism/website-copy#1231

[emcoding]

Thanks so much @pgaspar ! The thing is, we need the description from the track anatomy branch, and the tests from master. So, ta branch needs a rebase on master.
As it's only a few lines of text, I'm going to do the low tech solution and copy the relevant lines. YOLO

[emcoding]

Awesome to have this! Thanks.

As the TA branch and master have diverged, this regen brings in the master description. I copied in the text we need, but couldn't easily delete the text we don't need anymore.
I'll try to find a solution to avoid this kind of complications from now on.

[emcoding]

Cool!

[pgaspar]

As the TA branch and master have diverged, this regen brings in the master description. I copied in the text we need, but couldn't easily delete the text we don't need anymore.
I'll try to find a solution to avoid this kind of complications from now on.

Yes, having two long lived branches (master and trackanatomy) can complicate things a bit...