docs: update README.md with MSRV policy

- bdk_electrum: add MSRV section to README.md

Author: ValuedMammal

README.md

@@ -63,7 +63,15 @@ Fully working examples of how to use these components are in `/example-crates`:
 [`bdk_chain`]: https://docs.rs/bdk-chain/
 
 ## Minimum Supported Rust Version (MSRV)
-This library should compile with any combination of features with Rust 1.63.0.
+The BDK library maintains a MSRV of 1.63.0. This includes the following crates 
+
+- `bdk_core`
+- `bdk_chain`
+- `bdk_bitcoind_rpc`.
+- `bdk_esplora`.
+- `bdk_wallet`.
+
+The MSRV of `bdk_electrum` is 1.75.0.
 
 To build with the MSRV you will need to pin dependencies as follows:
 
@@ -80,7 +88,6 @@ cargo update -p indexmap --precise "2.5.0"
 cargo update -p security-framework-sys --precise "2.11.1"
 cargo update -p csv --precise "1.3.0"
 cargo update -p unicode-width --precise "0.1.13"
-cargo update -p [email protected] --precise "0.23.19"
 ```
 
 ## License

crates/electrum/README.md

@@ -3,5 +3,13 @@
 BDK Electrum extends [`electrum-client`] to update [`bdk_chain`] structures
 from an Electrum server.
 
+## Minimum Supported Rust Version (MSRV)
+This crate has a MSRV of 1.75.0.
+
+To build with MSRV you will need to pin dependencies as follows:
+```shell
+cargo update -p home --precise "0.5.9"
+```
+
 [`electrum-client`]: https://docs.rs/electrum-client/
 [`bdk_chain`]: https://docs.rs/bdk-chain/