Add semver check action (#31)

Also increments to 0.3.0 because #30 is not compatible.

Author: termoshtt

.github/workflows/rust.yml

@@ -123,3 +123,14 @@ jobs:
 
       - name: Check if stub file is up to date
         run: git diff --exit-code
+
+  semver-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Check semver
+        uses: obi1kenobi/cargo-semver-checks-action@v2
+        with:
+          package: pyo3-stub-gen, pyo3-stub-gen-derive

Cargo.lock

@@ -8,7 +8,7 @@ members = [
 resolver = "2"
 
 [workspace.package]
-version = "0.2.1"
+version = "0.3.0"
 edition = "2021"
 
 description = "Stub file (*.pyi) generator for PyO3"

Cargo.toml

@@ -18,5 +18,5 @@ serde.workspace = true
 toml.workspace = true
 
 [dependencies.pyo3-stub-gen-derive]
-version = "0.2.1"
+version = "0.3.0"
 path = "../pyo3-stub-gen-derive"