update version to 0.16.15 and add pypi workflow trigger when release

.github/workflows/pypi.yml

@@ -0,0 +1,23 @@
+name: pypi
+on:
+  release:
+    types:
+      - created
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v1
+        with:
+          python-version: '3.x'
+      - uses: dschep/install-poetry-action@v1.3
+      - name: Install requirements
+        run: make deps
+      - name: Build dists
+        run: python setup.py sdist
+      - name: Pypi Publish
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.pypi_password }}

tortoise/__init__.py

@@ -638,4 +638,4 @@ async def do_stuff():
         loop.run_until_complete(Tortoise.close_connections())
 
 
-__version__ = "0.16.14"
+__version__ = "0.16.15"