openmetrics/histograms: fix incorrect condition for bucketing
The buckets thresholds are to be taken as "less than or equal to".
The condition as written in the code did only "less than", not
"less than or equal to". That's fixed now.
For full information on our dependencies, version requirements, and
where to find them, see https://prosody.im/doc/depends
If you have luarocks available on your platform, install the following:
- luaexpat
- luasocket
- luafilesystem
- luasec