check without colors in ci

.github/workflows/rust.yml

@@ -18,6 +18,22 @@ jobs:
         with:
           command: check
           
+  check-no-default-features:
+    name: Check --no-default-features
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: Swatinem/rust-cache@v1
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --no-default-features
+
   test:
     runs-on: ubuntu-latest
     name: Tests