Merge pull request #130 from eric-wieser/patch-1

Mark nbval as incompatible with coverage 5.0.0

Author: takluyver

setup.py

@@ -26,7 +26,7 @@
         'jupyter_client',
         'nbformat',
         'ipykernel',
-        'coverage'
+        'coverage < 5',  # until gh-129 is fixed
     ],
     classifiers = [
         'Framework :: IPython',