Mention backwards compatibility in CONTRIBUTING.

[tnull]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1501 (cefac72) into main (1fd6c6f) will increase coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1501      +/-   ##
==========================================
+ Coverage   90.96%   91.45%   +0.48%     
==========================================
  Files          80       80              
  Lines       42808    47766    +4958     
  Branches    42808    47766    +4958     
==========================================
+ Hits        38942    43684    +4742     
- Misses       3866     4082     +216     

Impacted Files	Coverage Δ
lightning/src/util/events.rs	32.43% <0.00%> (-1.13%)	⬇️
lightning/src/chain/onchaintx.rs	93.98% <0.00%> (-0.93%)	⬇️
lightning/src/ln/priv_short_conf_tests.rs	97.09% <0.00%> (-0.87%)	⬇️
lightning/src/util/scid_utils.rs	98.75% <0.00%> (-0.45%)	⬇️
lightning-net-tokio/src/lib.rs	75.91% <0.00%> (-0.31%)	⬇️
lightning/src/ln/functional_tests.rs	97.18% <0.00%> (-0.01%)	⬇️
lightning/src/util/config.rs	44.21% <0.00%> (+0.21%)	⬆️
lightning/src/routing/router.rs	94.07% <0.00%> (+1.62%)	⬆️
lightning/src/ln/functional_test_utils.rs	97.67% <0.00%> (+2.22%)	⬆️
lightning/src/ln/channel.rs	91.70% <0.00%> (+3.09%)	⬆️
... and 2 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1fd6c6f...cefac72. Read the comment docs.

[dunxen]

ACK cefac72