Unpin nightly (#191)

seanpmorgan · web-flow · commit d25483421a03 · 2019-04-19T08:30:42.000-04:00
diff --git a/requirements.txt b/requirements.txt
@@ -1 +1 @@
-tf-nightly-2.0-preview==2.0.0.dev20190417
+tf-nightly-2.0-preview
