add version check

.github/workflows/version-check.yml

@@ -0,0 +1,19 @@
+name: PHP SDK Version Check
+on:
+  push:
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+"
+jobs:
+  linux:
+    name: Version Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set env
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/v}" >> $GITHUB_ENV
+      - name: Check
+        run: |
+          set -e
+          grep -qF "## ${RELEASE_VERSION}" CHANGELOG.md
+          grep -qF "const SDK_VER = '${RELEASE_VERSION}';" src/Qiniu/Config.php