Increase MSRV to 1.64.0

.github/workflows/ci.yml

@@ -13,14 +13,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [beta, stable, 1.60.0]
+        rust: [beta, stable, 1.64.0]
     steps:
       - uses: actions/checkout@v2
         with:
           submodules: true
       - uses: dtolnay/rust-toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
+      # Skip cargo update for MSRV validation build
+      - run: cargo update
+        if: ${{ matrix.rust == 'stable' || matrix.rust == 'beta' }}
       - name: Install Protoc
         uses: arduino/setup-protoc@v1
         with:
@@ -65,6 +68,6 @@ jobs:
         run: |
           cargo tarpaulin --verbose --timeout 120 --out Xml
       - name: Upload to codecov.io
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v3
         with:
           fail_ci_if_error: true

.gitignore

@@ -1,4 +1,3 @@
 /target
 **/*.rs.bk
 .cargo-ok
-Cargo.lock

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- The minimum supported rust version is now **1.64.0**.
+
 ## [0.4.1] - 2023-06-25
 
 ## Fixed