docs: specify description type for pypi to render correctly

Author: Nakul Pathak

CHANGES.md

@@ -217,9 +217,9 @@ VERSIONS WILL REQUIRE PYTHON 2.7 AND ABOVE.
 
 -   Logging levels have been reduced.
     -   Logging previously at the `logging.DEBUG` level is now logged at
-        the `kazoo.loggingsupport.BLATHER` level (5).
+    the `kazoo.loggingsupport.BLATHER` level (5).
     -   Some low-level logging previously at the `logging.INFO` level is
-        now logged at the `logging.DEBUG` level.
+    now logged at the `logging.DEBUG` level.
 -   Issue \#133: Introduce a new environment variable
     ZOOKEEPER\_PORT\_OFFSET for the testing support, to run the testing
     cluster on a different range.

setup.py

@@ -77,4 +77,5 @@
     extras_require={
         'test': tests_require,
     },
+    long_description_content_type="text/markdown",
 )