Release/0.21.0

[afilini]

Description

Merge the release branch back into master

Checklists

All Submissions:

• [x] I've signed all my commits
• [x] I followed the contribution guidelines
• [x] I ran cargo fmt and cargo clippy before committing

New Features:

• [ ] I've added tests for the new feature
• [ ] I've added docs for the new feature
• [ ] I've updated CHANGELOG.md

Bugfixes:

• [ ] This pull request breaks the existing API
• [ ] I've added tests to reproduce the issue which are now passing
• [ ] I'm linking the issue being fixed by this PR

[codecov[bot]]

Codecov Report

Merging #711 (8026bd9) into master (03d3c78) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #711   +/-   ##
=======================================
  Coverage   77.21%   77.21%           
=======================================
  Files          35       35           
  Lines        8987     8987           
=======================================
  Hits         6939     6939           
  Misses       2048     2048           

Impacted Files	Coverage Δ
src/descriptor/dsl.rs	92.75% <ø> (ø)
src/lib.rs	83.44% <ø> (ø)
src/wallet/mod.rs	97.01% <ø> (ø)
src/wallet/tx_builder.rs	91.66% <ø> (ø)

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