Merge #1046: Avoid pinning dependencies, use --precise in ci

ffb7c79 ci: Avoid pinning dependencies, use --precise (Daniela Brozzoni)
56b8eea ci: No need to add the llvm repository for wasm (Daniela Brozzoni)

Pull request description:

  Fixes #1035

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  evanlinjin:
    ACK ffb7c79

Tree-SHA512: a2e5e0ffea87dc86e27c2f2f3550e6e6429e66f5fd8e0196e85915de5b0f14f0e4ee9d56c87b38b101eb28d86a65868054c20421f32ecd475ca73d00471e2f8d

Author: danielabrozzoni

.github/workflows/cont_integration.yml

@@ -27,6 +27,9 @@ jobs:
             profile: minimal
       - name: Rust Cache
         uses: Swatinem/[email protected]
+      - name: Pin dependencies for MSRV
+        if: matrix.rust.version == '1.57.0'
+        run: cargo update -p log --precise "0.4.18" && cargo update -p tempfile --precise "3.6.0"
       - name: Build
         run: cargo build ${{ matrix.features }}
       - name: Test
@@ -71,7 +74,6 @@ jobs:
         uses: actions/checkout@v2
         # Install a recent version of clang that supports wasm32
       - run: wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - || exit 1
-      - run: sudo apt-add-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-10 main" || exit 1
       - run: sudo apt-get update || exit 1
       - run: sudo apt-get install -y libclang-common-10-dev clang-10 libc6-dev-i386 || exit 1
       - name: Install Rust toolchain

README.md

@@ -52,3 +52,15 @@ Fully working examples of how to use these components are in `/example-crates`
 [`rust-bitcoin`]: https://github.com/rust-bitcoin/rust-bitcoin
 [`esplora-client`]: https://docs.rs/esplora-client/0.3.0/esplora_client/
 [`electrum-client`]: https://docs.rs/electrum-client/0.13.0/electrum_client/
+
+## Minimum Supported Rust Version (MSRV)
+This library should compile with any combination of features with Rust 1.57.0.
+
+To build with the MSRV you will need to pin dependencies as follows:
+
+```
+# log 0.4.19 has MSRV 1.60.0+
+cargo update -p log --precise "0.4.18"
+# tempfile 3.7.0 has MSRV 1.63.0
+cargo update -p tempfile --precise "3.6.0"
+```

crates/bdk/Cargo.toml

@@ -13,7 +13,7 @@ edition = "2021"
 rust-version = "1.57"
 
 [dependencies]
-log = "=0.4.18"
+log = "0.4"
 rand = "^0.8"
 miniscript = { version = "9", features = ["serde"], default-features = false }
 bitcoin = { version = "0.29", features = ["serde", "base64", "rand"], default-features = false }