Merge branch 'master' into release/0.14.0

diff --cc CHANGELOG.md
index 5e06369a01b579591ffe82726a884915c2033607,866dc2e14874a81a8c0646f1f40e7e151ccfbdf3..9b135cba6e2b422c401e7e863e8ff08f24784b21
--- 1/CHANGELOG.md
--- 2/CHANGELOG.md
+++ b/CHANGELOG.md
@@@ -6,10 -6,11 +6,14 @@@ and this project adheres to [Semantic V
  
  ## [Unreleased]
  
 -- BIP39 implementation dependency, in `keys::bip39` changed from tiny-bip39 to rust-bip39.
 -- Add new method on the `TxBuilder` to embed data in the transaction via `OP_RETURN`. To allow that a fix to check the dust only on spendable output has been introduced.
+ - Overhauled sync logic for electrum and esplora.
+ - Unify ureq and reqwest esplora backends to have the same configuration parameters. This means reqwest now has a timeout parameter and ureq has a concurrency parameter.
+ - Fixed esplora fee estimation.
++
 +## [v0.14.0] - [v0.13.0]
 +
 +- BIP39 implementation dependency, in `keys::bip39` changed from tiny-bip39 to rust-bip39.
 +- Add new method on the `TxBuilder` to embed data in the transaction via `OP_RETURN`. To allow that a fix to check the dust only on spendable output has been introduced.
  - Update the `Database` trait to store the last sync timestamp and block height
  - Rename `ConfirmationTime` to `BlockTime`