Update cython install requirement

lmcinnes · lmcinnes · commit 54e8a19f6b7b · 2018-07-18T15:28:07.000-04:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,4 +1,4 @@
-cython>=0.22
+cython>=0.27
 numpy>=1.9
 scipy >= 0.9
 scikit-learn>=0.17
