fixup! Add workflow step for running testsuite of only one feature

Author: matthiasbeyer

.github/workflows/msrv.yml

@@ -110,7 +110,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --no-default-features --feature ${{ matrix.feature }}
+          args: --no-default-features --features ${{ matrix.feature }}
 
   fmt:
     needs: [check]