fix rust

.github/workflows/ci.yml

@@ -72,6 +72,7 @@ jobs:
       TARGET_DIR: ./target
       # Emit backtraces on panics.
       RUST_BACKTRACE: 1
+      RUST_MIN_SRV: "1.43.1"
     strategy:
       fail-fast: false
       matrix:
@@ -79,27 +80,27 @@ jobs:
         include:
         - build: linux
           os: ubuntu-18.04
-          rust: nightly
+          rust: stable
           target: x86_64-unknown-linux-musl
         - build: linux-arm
           os: ubuntu-18.04
-          rust: nightly
+          rust: stable
           target: arm-unknown-linux-gnueabihf
         - build: macos
           os: macos-latest
-          rust: nightly
+          rust: stable
           target: x86_64-apple-darwin
         - build: win-msvc
           os: windows-2019
-          rust: nightly
+          rust: stable
           target: x86_64-pc-windows-msvc
         - build: win-gnu
           os: windows-2019
-          rust: nightly-x86_64-gnu
+          rust: stable-x86_64-gnu
           target: x86_64-pc-windows-gnu
         - build: win32-msvc
           os: windows-2019
-          rust: nightly
+          rust: stable
           target: i686-pc-windows-msvc
     needs: check
     steps: