Enable tests on stable

Signed-off-by: Nathaniel McCallum <[email protected]>

Author: npmccallum

.github/workflows/lint.yml

@@ -9,7 +9,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           components: rustfmt
-          toolchain: nightly
+          toolchain: stable
           profile: minimal
           override: true
       - uses: actions-rs/cargo@v1
@@ -25,7 +25,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           components: clippy
-          toolchain: nightly
+          toolchain: stable
           profile: minimal
           override: true
       - uses: actions-rs/cargo@v1
@@ -40,7 +40,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: stable
           profile: minimal
           override: true
       - run: cargo install cargo-readme

.github/workflows/test.yml

@@ -18,6 +18,9 @@ jobs:
       fail-fast: false
       matrix:
         toolchain:
+          - 1.56.0
+          - stable
+          - beta
           - nightly
         crates:
           - {name: ciborium-ll}