Add version ceiling on cryptography transitive dependency

Fixes #52 Somewhere in the dependency tree, cryptography is being installed. In the recent 2.1 release of the cryptography package, Python 2.6 was deprecated.
mayn · Oct 12, 2017 · 7a71518 · 7a71518
1 parent 8c52a67
commit 7a71518
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/requirements-travis.txt b/requirements-travis.txt
@@ -1,2 +1,3 @@
+cryptography<2.1
 coveralls
 tox-travis