TST: pin numpy back in 3.2.x tests

tacaswell · tacaswell · commit 64a8ec34e0db · 2020-07-10T20:09:08.000-04:00
We did not backport the 1.19 compatibility fixes so the test suite
warns which we treat as a failure.
diff --git a/requirements/testing/travis_all.txt b/requirements/testing/travis_all.txt
@@ -2,7 +2,8 @@
 
 coverage
 cycler
-numpy
+# don't forward port this, 3.2.x warns with np 1.19 and up
+numpy<1.19
 pillow
 pyparsing
 pytest!=4.6.0,!=5.3.3,!=5.4.0
