Add release notes for `v0.3.0`

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+---
+title: "Release v0.3.0"
+description: "Announcing the v0.3.0 release of BDK"
+author: "Alekos Filini"
+date: "2021-01-20"
+tags: ["rust", "release"]
+hidden: true
+draft: false
+---
+
+A new release of BDK is out: the [`v0.3.0`] is a relatively small update compared to `v0.2.0`, but it still brings some nice APIs improvements and general bugfixes.
+
+You can find the full [v0.3.0 changelog][changelog] on GitHub.
+
+## What's new in v0.3.0
+
+Below are some highlights of the new improved APIs coming with this release:
+
+### Less verbosity when using `Wallet::new_offline()`
+
+Now you don't have to explicitly provide the `OfflineWallet<_>` type anymore, saving you one import and making it much less verbose to use.
+
+Where before you were doing:
+
+```rust
+let wallet: OfflineWallet<_> = Wallet::new_offline(...)?;
+```
+
+Now you can just write:
+
+```rust
+let wallet = Wallet::new_offline(...)?;
+```
+
+### No more error conversions in `DescriptorTemplate`
+
+The `DescriptorTemplate` trait has been updated to return a [`descriptor::error::Error`] instead of a `KeyError`. The [`descriptor!()`] macro has been updated as well, which means that now you can use the macro inside a `DescriptorTemplate::build()` implementation
+without having to [map the error](/blog/2020/12/release-v0.2.0/#descriptor-macro), like so:
+
+```rust
+pub struct TimeDecayingMultisig<K> {
+    pk_a: K,
+    pk_b: K,
+    timelock: u32,
+}
+
+impl<K: ToDescriptorKey<Segwitv0>> DescriptorTemplate for TimeDecayingMultisig<K> {
+    fn build(self) -> Result<DescriptorTemplateOut, descriptor::error::Error> {
+        bdk::descriptor!(wsh(thresh(2,pk(self.pk_a),s:pk(self.pk_b),s:d:v:older(self.timelock))))
+    }
+}
+```
+
+### A new repo for the CLI
+
+The `cli` module (and it's related `cli-utils` feature) have been removed from the main BDK repo and moved to their new home, the [bdk-cli] repo. The APIs exposed were mainly used internally, for the `repl` and the [playground](/bdk-cli/playground)
+in our website, but in case you were using one of those keep that in mind.
+
+## Contributors
+
+A huge thanks to everybody who contributed to this new release with suggestions, pull requests and bug reports.
+
+Since the `v0.2.0` release around a month ago, we've had `24` new commits made by `6` different contributors for a total of `404` additions and `1243` deletions. Here's the [full diff][gh_diff].
+
+A special thanks to the new contributor for this release:
+
+- [@tcharding][@tcharding] - Tobin C. Harding
+
+[changelog]: https://github.com/bitcoindevkit/bdk/blob/75669049268bbc294564f8c6e0528e07a546258f/CHANGELOG.md#v030---v020
+[gh_diff]: https://github.com/bitcoindevkit/bdk/compare/v0.2.0...v0.3.0
+[bdk-cli]: https://github.com/bitcoindevkit/bdk-cli
+
+[`descriptor!()`]: https://docs.rs/bdk/0.3.0/bdk/macro.descriptor.html
+[`descriptor::error::Error`]: https://docs.rs/bdk/0.3.0/bdk/descriptor/error/enum.Error.html
+
+[`v0.3.0`]: https://crates.io/crates/bdk/0.3.0
+
+[@tcharding]: https://github.com/tcharding