update CI

.github/workflows/rust.yml

@@ -1,22 +1,35 @@
 name: Rust
 
-on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-
-env:
-  CARGO_TERM_COLOR: always
+on: [push]
 
 jobs:
-  build:
-
+  build_test:
     runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        rust:
+        - 1.34.0
+        - stable
+        - beta
+        - nightly
     steps:
-    - uses: actions/checkout@v2
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
+    - uses: actions/checkout@v1
+    - uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+    - name: Test The Basics Everywhere
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+    - name: Test Stable and Later Features
+      if: matrix.rust != '1.34.0'
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --features=alloc --features=grab_spare_slice --features=rustc_1_40
+    - name: Test Nightly Features
+      if: matrix.rust == 'nightly'
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --all-features