Add README docs and CI job for MSRV

.github/workflows/ci.yaml

@@ -45,6 +45,37 @@ jobs:
       - name: Test with no default features
         run: cargo test --no-default-features
 
+  build-msrv:
+    name: Build (1.46.0)
+    runs-on: ubuntu-latest
+    env:
+      RUSTFLAGS: -D warnings
+      RUST_BACKTRACE: 1
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: "1.46.0"
+          profile: minimal
+
+      - name: Compile
+        run: cargo build --verbose
+
+      - name: Compile tests
+        run: cargo test --no-run
+
+      - name: Test
+        run: cargo test
+
+      - name: Test with all features
+        run: cargo test --all-features
+
+      - name: Test with no default features
+        run: cargo test --no-default-features
+
   rust:
     name: Lint and format Rust
     runs-on: ubuntu-latest

README.md

@@ -108,6 +108,11 @@ All features are enabled by default.
 - **std** - Enable linking to the [Rust Standard Library]. Enabling this feature
   adds [`Error`] implementations to error types in this crate.
 
+### Minimum Supported Rust Version
+
+This crate requires at least Rust 1.46.0. This version can be bumped in minor
+releases.
+
 ## License
 
 `focaccia` is licensed under the [MIT License](LICENSE) (c) Ryan Lopopolo.