python-isort: update to 4.3.21.

srcpkgs/python-isort/template

@@ -1,6 +1,6 @@
 # Template file for 'python-isort'
 pkgname=python-isort
-version=4.3.20
+version=4.3.21
 revision=1
 archs=noarch
 wrksrc="isort-${version}"
@@ -16,7 +16,7 @@ license="MIT"
 homepage="https://github.com/timothycrosley/isort"
 changelog="https://raw.githubusercontent.com/timothycrosley/isort/master/CHANGELOG.md"
 distfiles="${PYPI_SITE}/i/isort/isort-${version}.tar.gz"
-checksum=c40744b6bc5162bbb39c1257fe298b7a393861d50978b565f3ccd9cb9de0182a
+checksum=54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1
 alternatives="isort:isort:/usr/bin/isort2"
 
 do_check() {