Added `renderer` calling argument in `fields.CaptchaTextInput` `render` method, which is introduced in Django 1.11 and it will be required starting from Django 2.1, also to eliminate deprecation Warnings
Added `renderer` calling argument in `fields.CaptchaTextInput` `render` method, which is introduced in Django 1.11 and it will be required starting from Django 2.1, also to eliminate deprecation Warnings

mbi/django-simple-captcha,mbi/django-simple-captcha,mbi/django-simple-captcha