standard style

lib/file.js

@@ -38,7 +38,7 @@ class File extends EventEmitter {
     if (!this._torrent.bitfield) return 0
 
     const { pieces, bitfield, pieceLength } = this._torrent
-    const { _startPiece:start, _endPiece:end } = this
+    const { _startPiece: start, _endPiece: end } = this
     const piece = pieces[start]
 
     // Calculate first piece diffrently, it sometimes have a offset