Update PKGBUILD file

PKGBUILD

+# Maintainer: Hakan Dündar <hakandundar34coding@gmail.com>
+pkgname=system-monitoring-center
+_pkgver=0.1.21-beta19
+pkgver=${_pkgver//-/.}
+pkgrel=1
+pkgdesc="System performance and usage monitoring tool"
+arch=('x86_64')
+url="https://github.com/hakandundar34coding/system-monitoring-center"
+license=('GPL3')
+depends=('bash' 'dmidecode' 'gtk3' 'hwids' 'mesa-demos' 'python-gobject' 'python-opengl'
+         'systemd' 'util-linux')
+makedepends=('python-setuptools')
+source=("$pkgname-$pkgver.tar.gz::$url/archive/refs/tags/v$_pkgver.tar.gz")
+sha256sums=('2395148e32ed05abacf2aaa4709d837994b17a49ded8f6e204394849e5e7bfa1')
+
+build() {
+  cd "$pkgname-$_pkgver"
+  python setup.py build
+}
+
+package() {
+  cd "$pkgname-$_pkgver"
+  python setup.py install --root="$pkgdir" --optimize=1 --skip-build
+}