fix: use 7 char long commit hash

As a result of a typo, 8 character long commit hashes were parsed
instead of 7, which is the standard short commit hash.

Signed-off-by: Gabor Boros <gabor.brs@gmail.com>

cmd/root.go

@@ -347,7 +347,7 @@ func runRootCmd(_ *cobra.Command, _ []string) {
 	var err error
 
 	if viper.GetBool("version") {
-		fmt.Printf("%s version %s, commit %s (%s)\n", program, version, commit[:8], date)
+		fmt.Printf("%s version %s, commit %s (%s)\n", program, version, commit[:7], date)
 		os.Exit(0)
 	}