Fix GitHub Releases

Author: caelunshun

.azure-pipelines.yml

@@ -98,9 +98,11 @@ jobs:
         linux:
           image_name: 'ubuntu-16.04'
           platform: 'linux'
+          rustup_toolchain: 'stable'
         windows:
           image_name: 'windows-latest'
           platform: 'windows'
+          rustup_toolchain: 'stable'
         #macos:
         #  image_name: 'macOS-10.13'
         #  platform: 'macos'
@@ -119,7 +121,6 @@ jobs:
       - script: |
           curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $RUSTUP_TOOLCHAIN
           echo "##vso[task.setvariable variable=PATH;]$PATH:$HOME/.cargo/bin"
-          displayName: Install Rust
         condition: ne( variables['Agent.OS'], 'Windows_NT' )
         displayName: Install Rust