fix(definitions): feed name incorrectly small

[blaskovicz]

Grouped feeds can be a max of 258 characters long (128 for the group, a single dot,
and another 128 for the feed name).

Fixes #119

[brentru]

Thanks for the PR, feed names (without an appended group) can be >128 characters and we should support that.

However, this PR is failing during clang-format'ing. Could you please fix the formatting errors (https://github.com/adafruit/Adafruit_IO_Arduino/pull/126/checks?check_run_id=835702493#step:6:2) and bump the library version here (https://github.com/adafruit/Adafruit_IO_Arduino/blob/master/library.properties#L2) to 3.6.3?

[blaskovicz]

will look at it when i have time, thanks for the feedback 👍

[brentru]

this needs to be bumped , I'll bump from my end

[brentru]

This tests properly on hardware.

To test, I created a grouped feed with len 128 and then used example adafruitio_11_group_pub:

Adafruit IO connected.
sending example.ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff-> 0
sending example.count-2 -> 0

On io web, example.ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff correctly obtained value 0