Upgrading docker bindings for testing to ver. 3.5.0 (#792)

Author: diemol

tests/bootstrap.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 cd tests
 pip install selenium===3.14.0 \
-            docker===3.1.1 \
+            docker===3.5.0 \
             | grep -v 'Requirement already satisfied'
 
 python test.py $1 $2