Added changelog-enforcer to pull request workflow

.github/workflows/pull-request-checks.yaml

@@ -1,6 +1,12 @@
 name: Pull request checks
 
-on: [ pull_request ]
+on:
+    pull_request:
+        # The specific activity types are listed here to include "labeled" and "unlabeled"
+        # (which are not included by default for the "pull_request" trigger).
+        # This is needed to allow skipping enforcement of the changelog in PRs with specific labels,
+        # as defined in the (optional) "skipLabels" property.
+        types: [ opened, synchronize, reopened, ready_for_review, labeled, unlabeled ]
 
 jobs:
     tests:
@@ -37,7 +43,11 @@ jobs:
 
             - name: Run lint PHP
               run: composer run-script php-cs-fixer-dry-run
+              if: success() || failure()
 
              # Tests
             - name: Run PHP unit test suite
               run: vendor/bin/phpunit -v -c .
+
+            - uses: dangoslen/changelog-enforcer@v3
+              if: success() || failure()

CHANGELOG.md

@@ -1,14 +1,37 @@
-CHANGELOG
-=========
+# Changelog
 
-This changelog references the relevant changes (bug/security fixes, enhancements) done in minor versions.
-To get the diff between two versions, go to: https://github.com/freshheads/FHMultiSiteBundle/compare/v1.0.0...v1.0.1
+All notable changes to this project will be documented in this file.
 
-1.1
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-* Drops support for Symfony below version 4.4
-* Adds support for Symfony 5.x
-* Adds support for Twig 3
-* Marks bundle config classes as final in docblock; will be final in next major:
-    * FH\Bundle\MultiSiteBundle\DependencyInjection\Configuration
-    * FH\Bundle\MultiSiteBundle\DependencyInjection\FHMultiSiteExtension
+## Unreleased
+
+### Added
+
+- Added `changelog-enforcer` to pull request workflow.
+
+### Changed
+
+- Run pull request workflow also on lowest dependencies.
+- Added `php-cs-fixer/shim` as dev dependency.
+
+### Removed
+
+- Removed support for PHP 7.3.
+- Removed `bamarni/composer-bin-plugin` dev dependency.
+
+## 1.1.0 - 2020-07-08
+
+### Added
+
+- Added support for Symfony 5.x.
+- Added support for Twig 3.
+
+### Removed
+
+- Dropped support for Symfony below version 4.4.
+
+### Deprecated
+
+- Marked classes in `FH\Bundle\MultiSiteBundle\DependencyInjection` as final in docblock; will be final in next major.