remove dependency pinning from setup.py as aptly-api-client is a library. Fixes #8.

Author: jdelic

setup.py

@@ -23,9 +23,9 @@
 _packages = find_packages(_package_root, exclude=["*.tests", "*.tests.*", "tests.*", "tests"])
 
 _requirements = [
-    'typing==3.6.2',
-    'requests==2.18.4',
-    'iso8601==0.1.12',
+    'typing',
+    'requests',
+    'iso8601',
     # intentionally unpinned, we want the newest data
     'pytz',
 ]