fix workflow

Author: ma2za

.github/workflows/ci_publish.yml

@@ -1,5 +1,8 @@
 name: Upload Python Package
-on: [ push ]
+on:
+  push:
+    branches:
+      - main
 jobs:
   deploy:
     runs-on: ubuntu-latest

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "python-substack"
-version = "0.1.0"
+version = "0.1.1"
 description = "A Python wrapper around the Substack API."
 authors = ["Paolo Mazza <mazzapaolo2019@gmail.com>"]
 license = "MIT"