added upper bound to version, update is going to be bigger than I initially thought

Author: Greg Caporaso

biab/util.py

@@ -110,7 +110,7 @@ def expand_file(fp):
 
     with open(fp) as f:
         lines = f.readlines()
-        ast = cm.Parser().parse(''.join(lines))
+        ast = cm.DocParser().parse(''.join(lines))
 
     root = Node()
     root.file = fp

setup.py

@@ -45,7 +45,7 @@
       test_suite='nose.collector',
       packages=find_packages(),
       scripts=glob("scripts/*"),
-      install_requires=['ipymd', 'PyYAML', 'CommonMark', 'click', 'jupyter',
+      install_requires=['ipymd', 'PyYAML', 'CommonMark < 0.6.0', 'click', 'jupyter',
                         'six', 'runipy', 'boto', 'markdown2'],
       extras_require={'test': ["nose >= 0.10.1", "pep8", "flake8"]},
       classifiers=classifiers,