Pin dependencies to older versions

Just to get master back up and running again, pin libraries to the
versions we used back when the latest development happened.

I'll start upgrading them gradually, but need a green master first.

Author: Hugo Osvaldo Barrera

setup.py

@@ -12,7 +12,7 @@
 
 requirements = [
     # https://github.com/mitsuhiko/click/issues/200
-    'click>=5.0',
+    'click>=5.0,<6.0',
     'click-log>=0.3.0, <0.4.0',
 
     # https://github.com/pimutils/vdirsyncer/issues/478

test-requirements.txt

@@ -1,4 +1,4 @@
-hypothesis>=3.1
+hypothesis>=3.1,<4.0
 pytest
 pytest-localserver
 pytest-subtesthack