Add v8 version information to README

Author: perazz

README.md

@@ -47,5 +47,6 @@ Previous versions default to the latest stable release, which is fetched automat
 | v6              | latest                |
 | v6.1.0          | latest                |
 | v7              | 0.11.0                |
+| v8              | 0.11.0                |
 
 Note: `fpm` changed asset naming convention starting version `v0.11.0`. So, the `latest` option will not work anymore with versions of `setup-fpm` prior to `v7`.