Be more explicit about our dependencies, no major update pls

Author: buckket

setup.py

@@ -29,10 +29,10 @@
     platforms='any',
 
     install_requires=[
-        'aiohttp',
-        'python-dateutil',
-        'humanize',
-        'click',
+        'aiohttp>=2.2.5,<3',
+        'python-dateutil>=2.6.1,<3',
+        'humanize>=0.5.1,<1',
+        'click>=6.7,<7',
     ],
 
     extras_require={