chore(docs): update README with steps to run just MSRV recipe

Signed-off-by: shytypes <abbaadamu302@gmail.com>

Author: AdamuAbba

README.md

@@ -16,13 +16,4 @@ Bitcoin Esplora API client library. Supports plaintext, TLS and Onion servers. B
 
 This library should compile with any combination of features with Rust 1.75.0.
 
-To build with the MSRV you will need to pin dependencies as follows:
-
-```shell
-cargo update -p minreq --precise "2.13.2"
-cargo update -p home --precise "0.5.9"
-cargo update -p native-tls --precise "0.2.13"
-cargo update -p idna_adapter --precise "1.2.0"
-cargo update -p zerofrom --precise "0.1.5"
-cargo update -p litemap --precise "0.7.4"
-```
+To build with the MSRV of 1.75.0 you may need to pin dependencies by running the [`pin-msrv.sh`](./ci/pin-msrv.sh) script.