Prepare release 0.1.5

Following #11, I couldn't see any dependency on a particular netaddr version so should be fine to go ahead and release a new version.

Author: mirceaulinic

setup.py

@@ -13,7 +13,7 @@
 
 setup(
     name="napalm-servertech-pro2",
-    version="0.1.4",
+    version="0.1.5",
     packages=find_packages(),
     author="Antoine Meillet",
     author_email="antoine.meillet@gmail.com",