Fix small code block issue in README + v1.3.1 release#28

ronanboiteau merged 2 commits intomainronanboiteau/django_safe_template_engine:mainfrom

rb-240418-prepare-1.3.1-releaseronanboiteau/django_safe_template_engine:rb-240418-prepare-1.3.1-releaseCopy head branch name to clipboard