CI: Pin NumPy in 3.6 build (#19138)

TomAugspurger · web-flow · commit d5194e5692a3 · 2018-01-08T10:41:38.000-06:00
* CI: Pin NumPy in 3.6 build

* Syntax
diff --git a/ci/requirements-3.6.build b/ci/requirements-3.6.build
@@ -2,5 +2,5 @@ python=3.6*
 python-dateutil
 pytz
 nomkl
-numpy
+numpy=1.13.*
 cython
