Add q short flag for flightsql (#304)

Author: matthewmturner

docs/cli.md

@@ -14,7 +14,7 @@ dft -c "SELECT 1+2"
 
 ## FlightSQL Mode
 
-Use --flightsql to run against a FlightSQL server (instead of the default local SessionContext). You can override the default host for that single command with --host
+Use `--flightsql` or `-q` to run against a FlightSQL server (instead of the default local SessionContext). You can override the default host for that single command with --host
 
 ```sh
 dft -f query.sql --flightsql --host "http://127.0.0.1:50052"

src/args.rs

@@ -58,7 +58,11 @@ pub struct DftArgs {
     #[clap(long, help = "Path to the configuration file")]
     pub config: Option<String>,
 
-    #[clap(long, help = "Use the FlightSQL client defined in your config")]
+    #[clap(
+        long,
+        short = 'q',
+        help = "Use the FlightSQL client defined in your config"
+    )]
     pub flightsql: bool,
 
     #[clap(long, help = "Run DDL prior to executing")]