Auto publish to crates.io on new tag push

.github/workflows/publish.yml

@@ -0,0 +1,13 @@
+on:
+  push:
+    tags:        
+      - 'v.*.*'
+steps:
+    - uses: actions/checkout@v2
+    - uses: actions-rs/toolchain@v1
+      with:
+          toolchain: stable
+          override: true
+    - uses: katyo/publish-crates@v1
+      with:
+          registry-token: ${{ secrets.CARGO_REGISTRY_TOKEN }}