django-jsonfield2: Add package

This package mainly serves to support django-post-office 3.3.0, as that
version switched its dependency from jsonfield to jsonfield2 (a fork of
jsonfield).

The version packaged in this package (3.0.3) is the last version that
supports Django 1.11.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/django-jsonfield2/Makefile

@@ -0,0 +1,49 @@
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+# Please do not update: 3.0.3 is the last version compatible with Django 1.11
+PKG_NAME:=django-jsonfield2
+PKG_VERSION:=3.0.3
+PKG_RELEASE:=1
+
+# Source for 3.0.3 is not available from PyPI
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/rpkilby/jsonfield2/tar.gz/$(PKG_VERSION)?
+PKG_HASH:=4b79ac28738671fe27cadbd537d50130c35a286207d31d8320c7b48b6cda36ca
+
+PKG_MAINTAINER:=Jeffery To <jeffery.to@gmail.com>
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=LICENSE
+
+PKG_BUILD_DIR:=$(BUILD_DIR)/jsonfield2-$(PKG_VERSION)
+PKG_BUILD_PARALLEL:=1
+
+include $(INCLUDE_DIR)/package.mk
+include ../python3-package.mk
+
+define Package/python3-django-jsonfield2
+  SUBMENU:=Python
+  SECTION:=lang
+  CATEGORY:=Languages
+  TITLE:=A reusable Django field to store validated JSON in models
+  URL:=https://github.com/rpkilby/jsonfield2
+  DEPENDS:=+python3-light +python3-decimal +django
+  CONFLICTS:=python3-django-jsonfield
+endef
+
+define Package/python3-django-jsonfield2/description
+  A modern fork of django-jsonfield, compatible with the latest versions
+  of Django.
+
+  jsonfield2 is a reusable model field that allows you to store
+  validated JSON, automatically handling serialization to and from the
+  database.
+endef
+
+$(eval $(call Py3Package,python3-django-jsonfield2))
+$(eval $(call BuildPackage,python3-django-jsonfield2))
+$(eval $(call BuildPackage,python3-django-jsonfield2-src))