allow prov to use latest release

Author: satra

nipype/info.py

@@ -137,7 +137,7 @@ def get_nipype_gitversion():
     'traits>=%s' % TRAITS_MIN_VERSION,
     'future>=%s' % FUTURE_MIN_VERSION,
     'simplejson>=%s' % SIMPLEJSON_MIN_VERSION,
-    'prov==%s' % PROV_VERSION,
+    'prov>=%s' % PROV_VERSION,
     'click>=%s' % CLICK_MIN_VERSION,
     'funcsigs',
     'pytest>=%s' % PYTEST_MIN_VERSION,

requirements.txt

@@ -6,7 +6,7 @@ python-dateutil>=1.5
 nibabel>=2.1.0
 future>=0.16.0
 simplejson>=3.8.0
-prov==1.5.0
+prov>=1.5.0
 click>=6.6.0
 funcsigs
 configparser