Cater ATtiny45

[moononournation]

Same code is working on ATtiny85 but not working on ATtiny45: https://github.com/moononournation/NeoPixelHexPendant/blob/main/NeoPixelHexPendant/NeoPixelHexPendant.ino
I know memory is an issue, but it still not working even reduced the number of pixel and array to 1.
It should caused by the code checked defined __AVR_ATtiny85__ but not checked ATtiny45.

[ladyada]

we dont have any attiny45's so you could submit a PR to add that as a check and verify it works.

[moononournation]

Ok, if I have a project use ATtiny45 and around 20 NeoPixels, I will try to work it out.