Query AWS RDS Data from the command line
```bash
$ cargo build
...
$ target/debug/query-rds-data --help
query-rds-data 0.3.0
Query an Amazon RDS database
USAGE:
query-rds-data [OPTIONS] --aws-profile
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
-p, --aws-profile
AWS source profile to use. This name references an entry in
~/.aws/credentials [env: AWSPROFILE=sandbox]
-r, --aws-region
AWS region to target. [env: AWSDEFAULT_REGION=] [default:
us-east-1]
-i, --db-cluster-identifier
RDS database identifier, for example: indi-primary.
ARGS:
SQL query.
```