Add Python 3 support

.travis.yml

@@ -0,0 +1,8 @@
+language: python
+python:
+  - "2.7"
+  - "3.4"
+install: pip install -r requirements.txt
+script: make check
+notifications:
+  email: false

README.md

@@ -1,5 +1,7 @@
 # backoff
 
+[![Build Status](https://travis-ci.org/litl/backoff.png?branch=master)](https://travis-ci.org/litl/backoff?branch=master)
+
 Function decoration for pluggable backoff and retry
 
 This module provides function decorators which can be used to wrap a

backoff.py

@@ -1,4 +1,5 @@
 # coding:utf-8
+from __future__ import unicode_literals
 
 """
 Function decoration for pluggable backoff and retry
@@ -154,7 +155,7 @@ def constant(interval):
 
 # Formats a function invocation as a unicode string for logging.
 def _invoc_repr(f, args, kwargs):
-    args_out = ", ".join(unicode(a) for a in args)
+    args_out = ", ".join("%s" % a for a in args)
     if args and kwargs:
         args_out += ", "
     if kwargs: