Removed unnecessary dependency

I initially intended to use @bitfield's script more than I did, but it
seems silly to include it just to read a file.

go.mod

@@ -3,7 +3,6 @@ module glgroups
 go 1.15
 
 require (
-	github.com/bitfield/script v0.18.0
 	github.com/go-ldap/ldap v3.0.3+incompatible
 	gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d // indirect
 	gopkg.in/yaml.v2 v2.2.2

main.go

@@ -12,7 +12,6 @@ import (
 	"os"
 	"strings"
 
-	"github.com/bitfield/script"
 	"github.com/go-ldap/ldap"
 	"gopkg.in/yaml.v2"
 )
@@ -116,7 +115,7 @@ func loadConfiguration() (configuration Configuration) {
 	} else {
 		cfgFile = os.Args[1]
 	}
-	cfgData, err := script.File(cfgFile).Bytes()
+	cfgData, err := ioutil.ReadFile(cfgFile)
 	if err != nil {
 		log.Fatalf("could not load configuration: %v", err)
 	}