fix license name

PKGBUILD

@@ -6,11 +6,11 @@
 
 pkgname=python-qrcode
 pkgver=7.3
-pkgrel=1
+pkgrel=2
 pkgdesc='Python library to generate QR codes'
 arch=('any')
 url='https://github.com/lincolnloop/python-qrcode'
-license=('custom')
+license=('BSD')
 depends=('python')
 makedepends=('python-setuptools')
 optdepends=('python-pillow: generate images')