Add terser (JS compressor for ES5 and ES6) (jazzband#696)

* Add terser JS compressor

* Update authors

Merge pull request jazzband#726 from jazzband/django-3.1

Add complet support for Django 3.1

Merge pull request jazzband#721 from jazzband/css-html-js-minify

Add css-html-js-minify compressor

Fix setup.py

Merge pull request jazzband#718 from jazzband/dropping-python2-support

Dropping python2 support

Update HISTORY.rst

Fix packaging

1.6.13

* Fix forward-slashed paths on Windows. Thanks to @etiago
* Fix CSS URL detector to match quotes correctly. Thanks to @vskh
* Add a compiler_options dict to compile, to allow passing options to custom compilers. Thanks to @sassanh
* Verify support for Django 1.11. Thanks to @jwhitlock

bump version

bump version