Django-tables2

- Made positional `data` argument to the table `__init__()` a keyword argument to make inheritance easier. Will raise a `TypeError` if omitted.

- Allow export file name customization [484](https://github.com/bradleyayers/django-tables2/pull/484) by [federicobond](https://github.com/federicobond)
- Fixed a bug where template columns were not rendered for pinned rows ([483](https://github.com/bradleyayers/django-tables2/pull/483) by [khirstinova](https://github.com/khirstinova), fixes [#482](https://github.com/bradleyayers/django-tables2/issues/482))

- Added Hungarian translation [471](https://github.com/bradleyayers/django-tables2/pull/471) by [hmikihth](https://github.com/hmikihth).
- Added TemplateColumn.value() and enhanced export docs (fixes [470](https://github.com/bradleyayers/django-tables2/issues/470))
- Fixed display of pinned rows if table has no data. [477](https://github.com/bradleyayers/django-tables2/pull/477) by [khirstinova](https://github.com/khirstinova)

- Added `ManyToManyColumn` automatically added for `ManyToManyField`s.

- Allow customizing the value used in `Table.as_values()` (when using a `render_<name>` method) using a `value_<name>` method. (fixes [458](https://github.com/bradleyayers/django-tables2/issues/458))
- Allow excluding columns from the `Table.as_values()` output. (fixes [459](https://github.com/bradleyayers/django-tables2/issues/459))
- Fixed unicode handling for column headers in `Table.as_values()`

- Allow computable attrs for `<td>`-tags from `Table.attrs` ([457](https://github.com/bradleyayers/django-tables2/pull/457), fixes [#451](https://github.com/bradleyayers/django-tables2/issues/451))