Minimum Requirements for pg_monz

[zyake]

I noticed that pg_monz required "bc" command in pgsql_server_funcs.sh.
Would it be possible for you to add "bc" command as minimum requirement?

[zyake]

I also find out that zabbix-sender is also required.

[pengbo0328]

I think It is mentioned in the document that zabbix-sender is required.

http://pg-monz.github.io/pg_monz/index-en.html#software
| pg_monz requires the following software products:
| Also note that Zabbix Agent and Zabbix Sender must be installed on the monitoring target server
| since it utilizes the functions of Zabbix Agent and Zabbix Sender for acquiring PostgreSQL information.

[pengbo0328]

Add "bc" command to requirement.

http://pg-monz.github.io/pg_monz/index-en.html#software