Remove upper bound on tqdm version.

drvinceknight · marcharper · commit c629ffc30617 · 2017-05-01T17:45:04.000-07:00
This upper bound is restrictive and not necessary. Also this aligns with #991.
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 numpy>=1.9.2
 matplotlib>=1.4.2
 hypothesis>=3.2
-tqdm==3.4.0
+tqdm>=3.4.0
 prompt-toolkit>=1.0.7
