Pin pypandoc (transitive depedency of setuptools-markdown) due to

breaking change in pypandoc 1.8
(man-group/pytest-plugins#87 (comment)).

setup.py

@@ -11,7 +11,7 @@
     keywords=['benchmarking', 'visualization'],
     install_requires=['django>=1.11<2.2', 'isodate>=0.4.7,<0.6', 'matplotlib>=1.4.3,<2.0'],
     packages=find_packages(exclude=['ez_setup', 'sample_project']),
-    setup_requires=['setuptools-markdown'],
+    setup_requires=['pypandoc==1.7.5', 'setuptools-markdown'],
     long_description_markdown_filename='README.md',
     description='A web application to monitor and analyze the performance of your code',
     include_package_data=True,