Update tf requirements to use older version

Irina Nicolae · Irina Nicolae · commit 20a1e306d4d3 · 2018-04-11T11:50:59.000+01:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,8 +1,8 @@
+tensorflow==1.1
 h5py
 Keras
 matplotlib
 scipy
 sphinx
 sphinx-autobuild
 sphinx_rtd_theme
-tensorflow==1.4
