Added v8.6.6, v8.7.1, v8.8.2 and v8.9.1
Added v8.6.6, v8.7.1, v8.8.2 and v8.9.1

These multiple patch releases are becoming quite tiresome,
may need to re-write the processor code,
to handle these (now frequent) scenarios.

leekelleher/umbraco-archive-processor,leekelleher/umbraco-archive-processor