[BD-24] [TNL-7661] [BB-3172] Bump up the version (#123)

* bump up the version

* update changelog

README.rst

@@ -298,8 +298,8 @@ Please do not report security issues in public. Send security concerns via email
 Changelog
 =========
 
-Unreleased
-----------
+2.4 - 2020-12-01
+----------------
 
 * Partially implemented the Assignment and Grades Service to enable tools
   reporting grades back.  Tools cannot create new LineItems.

setup.py

@@ -49,7 +49,7 @@ with open('README.rst') as _f:
 
 setup(
     name='lti-consumer-xblock',
-    version='2.3.2',
+    version='2.4.0',
     description='This XBlock implements the consumer side of the LTI specification.',
     long_description=long_description,
     long_description_content_type='text/markdown',