lint fixes

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

util/pool/default.go

@@ -49,7 +49,7 @@ func (p *poolConn) Close() error {
 	return nil
 }
 
-func (p *poolConn) Id() string {
+func (p *poolConn) ID() string {
 	return p.id
 }
 

util/pool/pool.go

@@ -21,7 +21,7 @@ type Pool interface {
 // Conn conn pool interface
 type Conn interface {
 	// unique id of connection
-	Id() string
+	ID() string
 	// time it was created
 	Created() time.Time
 	// embedded connection