check-rds.rb connections are literal, not percentage as should according description

[jindraj]

from help:

…
        --connections-critical-over N
                                     Trigger a critical if connections usage is over a percentage
        --connections-warning-over N Trigger a warning if connections usage is over a percentage

parameters passed --connections-warning-over 70 --connections-critical-over 85
check output: CheckRDS CRITICAL: RDSNAME: ; DatabaseConnections are 87 (expected lower than 85.0); DatabaseConnections are 87 (expected lower than 70.0)

max_connections on RDS insance:

┌─────────────────┐
│ max_connections │
├─────────────────┤
│ 3429            │
└─────────────────┘