Add link to 3.13 version
Add link to 3.13 version

Also mark 3.12 as LTS and 3.7 as EOL

nickanderson/documentation-generator,nickanderson/documentation-generator,cfengine/documentation-generator,cfengine/documentation-generator,cfengine/documentation-generator,nickanderson/documentation-generator,cfengine/documentation-generator,nickanderson/documentation-generator,nickanderson/documentation-generator,cfengine/documentation-generator