chore(docs): update TOC

Author: julienloizelet

docs/DEVELOPER.md

@@ -21,8 +21,11 @@
     - [End-to-end tests](#end-to-end-tests)
     - [Coding standards](#coding-standards)
       - [PHPCS Fixer](#phpcs-fixer)
+      - [PHPSTAN](#phpstan)
       - [PHP Mess Detector](#php-mess-detector)
       - [PHPCS and PHPCBF](#phpcs-and-phpcbf)
+      - [PSALM](#psalm)
+      - [PHP Unit Code coverage](#php-unit-code-coverage)
     - [Generate CrowdSec tools and settings on start](#generate-crowdsec-tools-and-settings-on-start)
     - [Redis debug](#redis-debug)
     - [Memcached debug](#memcached-debug)