Update changelog for v5.1.0

CHANGELOG.md

@@ -1,5 +1,33 @@
 # CHANGELOG
 
+## [v5.1.0](https://github.com/softspring/notification-bundle/releases/tag/v5.1.0)
+
+### Upgrading
+
+*Nothing to do on upgrading*
+
+### Commits
+
+- [0237cc8](https://github.com/softspring/notification-bundle/commit/0237cc87ce534c27a0176401537d474a39f1d354): Upgrade softspring dependencies to ^5.1
+- [48b7164](https://github.com/softspring/notification-bundle/commit/48b71643e6b47d19eb9edd591339dad678e42e15): Fix code style for newer php-cs-fixer versions
+- [732cddb](https://github.com/softspring/notification-bundle/commit/732cddb070e5bb2fc2ca73a5d9dd6afb396f5159): Configure dependabot and phpmd
+- [fe31874](https://github.com/softspring/notification-bundle/commit/fe31874245346a68c7ed5aa05ba5140a8fa70a69): Update changelog for v5.0.6
+- [212cc82](https://github.com/softspring/notification-bundle/commit/212cc82a8caee281458a54314ee7ed1a12eaf145): Configure new 5.1 development version
+- [ac9a2bb](https://github.com/softspring/notification-bundle/commit/ac9a2bbaf69101816f2e68525edf101aa8a1d04f): Add 5.1 branch alias to composer.json
+
+### Changes
+
+```
+ .github/dependabot.yml                    | 11 ++++++
+ .github/workflows/php.yml                 |  4 +--
+ .github/workflows/phpmd.yml               | 57 +++++++++++++++++++++++++++++++
+ CHANGELOG.md                              |  4 ---
+ README.md                                 |  2 +-
+ composer.json                             |  5 +--
+ src/DependencyInjection/Configuration.php | 26 +++++++-------
+ 7 files changed, 87 insertions(+), 22 deletions(-)
+```
+
 ## [v5.0.5](https://github.com/softspring/notification-bundle/releases/tag/v5.0.5)
 
 ### Upgrading