Change the size limit type to an int64

connection.go

@@ -4,7 +4,7 @@ import "io"
 import "net"
 // import "time"
 
-const defaultSizeLimit = 1024 * 1024 // 1 megabyte
+const defaultSizeLimit int64 = 1024 * 1024 // 1 megabyte
 
 // Conn is a HOPP connection.
 type Conn interface {
@@ -25,7 +25,7 @@ type Conn interface {
 
 	// SetSizeLimit sets a limit (in bytes) for how large messages can be.
 	// By default, this limit is 1 megabyte.
-	SetSizeLimit(limit int)
+	SetSizeLimit(limit int64)
 }
 
 // Trans is a HOPP transaction.