Added release dates in CHANGES.rst
Added release dates in CHANGES.rst

illing2005/django-rest-framework-gis,manhg/django-rest-framework-gis,arjenvrielink/django-rest-framework-gis,bopo/django-rest-framework-gis,djangonauts/django-rest-framework-gis,barseghyanartur/django-rest-framework-gis,sh4wn/django-rest-framework-gis