Using slightly older numpy for the py2.7 astropy 1.3 appveyor setup
@@ -18,7 +18,7 @@ environment:
matrix:
- PYTHON_VERSION: "2.7"
ASTROPY_VERSION: "1.3"
- NUMPY_VERSION: "stable"
+ NUMPY_VERSION: "1.13"
- PYTHON_VERSION: "3.6"
ASTROPY_VERSION: "stable"
