Merge pull request #6280 from rdeioris/docs/changelog_for_fast_call_readonly

Added changelog for /v3/contracts/fast-call-read

Author: rdeioris

CHANGELOG.md

@@ -7,10 +7,13 @@ and this project adheres to the versioning scheme outlined in the [README.md](RE
 
 ## Unreleased
 
-- The HTTP `Date` header in responses now strictly follows RFC7231.
+### Added
+
+- Added `/v3/contracts/fast-call-read/:principal/:contract_name/:func_name` api endpoint. It allows to run read-only calls faster by disabling the cost and memory trackers. This endpoint requires authentication.
 
 ### Changed
 
+- The HTTP `Date` header in responses now strictly follows RFC7231.
 - When a previous block commit is unable to be RBFed, the miner will now just wait for it to be confirmed instead of submitting a new block commit which breaks the miner's UTXO chain.
 
 ### Fixed