use latest tarpaulin (#6)

Author: jtr109

.github/workflows/rust.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Run cargo-tarpaulin
         uses: actions-rs/tarpaulin@v0.1
         with:
-          version: '0.9.0'
+          # version: '0.9.0'
           args: '-- --test-threads 1'
       - name: Upload to codecov.io
         uses: codecov/codecov-action@v1.0.2