fix problem which cropped up in new python versions

hatchery/project.py

@@ -5,9 +5,14 @@
 import microcache
 import pypandoc
 import funcy
-from pkg_resources.extern import packaging
 from . import helpers
 
+# packaging got moved into its own top-level package in recent python versions
+try:
+    from pkg_resources.extern import packaging
+except ImportError:
+    import packaging
+
 logger = logging.getLogger(__name__)
 logging.getLogger('requests').setLevel(logging.ERROR)