Remove readme checking

Checking markdown descriptions is not necessary.
See https://github.com/pypa/readme_renderer#markdown

.travis.yml

@@ -32,11 +32,6 @@ matrix:
           - tox --installpkg ./dist/djangorestframework-*.whl
           - tox  # test sdist
 
-      - python: "3.6"
-        env: TOXENV=readme
-        addons:
-          apt_packages: pandoc
-
     exclude:
       - { python: "2.7", env: DJANGO=master }
       - { python: "2.7", env: DJANGO=2.0 }

requirements/requirements-packaging.txt

@@ -6,6 +6,3 @@ twine==1.9.1
 
 # Transifex client for managing translation resources.
 transifex-client==0.11
-
-# readme_renderer to check readme syntax
-readme_renderer

tox.ini

@@ -5,7 +5,7 @@ envlist =
        {py34,py35,py36}-django20,
        {py35,py36}-django21
        {py35,py36}-djangomaster,
-       dist,lint,docs,readme,
+       dist,lint,docs,
 
 [travis:env]
 DJANGO =
@@ -50,8 +50,3 @@ commands = mkdocs build
 deps =
        -rrequirements/requirements-testing.txt
        -rrequirements/requirements-documentation.txt
-
-[testenv:readme]
-commands = ./setup.py check -rs
-deps =
-       -rrequirements/requirements-packaging.txt