nits (imports) and contributors file

Author: liamsi

CONTRIBUTORS

@@ -13,3 +13,4 @@ Antonio Marcedone <a.marcedone@gmail.com>
 Cesar Ghali <cghali@uci.edu>
 Daniel Ziegler <dmz@yahoo-inc.com>
 Gary Belvin <gdbelvin@gmail.com>
+Ismail Khoffi <Ismail.Khoffi@gmail.com>

core/monitor/verify.go

@@ -23,14 +23,13 @@ import (
 	"errors"
 	"math/big"
 
-	"github.com/golang/glog"
+	"github.com/google/keytransparency/core/mutator/entry"
 
+	"github.com/golang/glog"
 	"github.com/google/trillian/merkle"
 	"github.com/google/trillian/storage"
-
 	tcrypto "github.com/google/trillian/crypto"
 
-	"github.com/google/keytransparency/core/mutator/entry"
 	ktpb "github.com/google/keytransparency/core/proto/keytransparency_v1_types"
 )