CHANGELOG.md Implementation for python

.github/workflows/changelog.yml

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+# This action requires that any PR targeting the main branch should touch at
+# least one CHANGELOG file. If a CHANGELOG entry is not required, add the "Skip
+# Changelog" label to disable this action.
+
+name: changelog
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+    branches:
+      - master
+    paths-ignore:
+      - python/sqlcommenter-python/**
+
+jobs:
+  changelog:
+    runs-on: ubuntu-latest
+    steps:
+        - run: 'echo "No build required" '

.github/workflows/python-changelog.yml

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+# This action requires that any PR targeting the main branch should touch at
+# least one CHANGELOG file. If a CHANGELOG entry is not required, add the "Skip
+# Changelog" label to disable this action.
+
+name: changelog
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+    branches:
+      - master
+    paths:
+      - python/sqlcommenter-python/**
+
+jobs:
+  changelog:
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.pull_request.labels.*.name, 'Skip Changelog')"
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Check for CHANGELOG changes
+        working-directory: ./python/sqlcommenter-python
+        run: |
+          # Only the latest commit of the feature branch is available
+          # automatically. To diff with the base branch, we need to
+          # fetch that too (and we only need its latest commit).
+          git fetch origin ${{ github.base_ref }} --depth=1
+          if [[ $(git diff --name-only FETCH_HEAD | grep CHANGELOG) ]]
+          then
+            echo "A CHANGELOG was modified. Looks good!"
+          else
+            echo "No CHANGELOG was modified."
+            echo "Please add a CHANGELOG entry, or add the \"Skip Changelog\" label if not required."
+            false
+          fi

python/sqlcommenter-python/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+### Added
+- CHANGELOG.md Implementation for python
+  ([#142](https://github.com/google/sqlcommenter/pull/142))
+
+### Fixed