fluent-bundle setup.py fix for Python 2.7

Author: spookylukey

fluent-bundle/setup.py

@@ -1,5 +1,12 @@
 #!/usr/bin/env python
 from setuptools import setup
+import sys
+
+if sys.version_info < (3, 4):
+    extra_requires = ['singledispatch>=3.4']
+else:
+    # functools.singledispatch is in stdlib from Python 3.4 onwards.
+    extra_requires = []
 
 setup(name='fluent_bundle',
       version='0.1',
@@ -17,7 +24,7 @@
           'Programming Language :: Python :: 3.5',
       ],
       packages=['fluent', 'fluent.bundle'],
-      install_requires=['fluent>=0.9,<0.10'],
+      install_requires=['fluent>=0.9,<0.10'] + extra_requires,
       tests_require=['six'],
       test_suite='tests'
-)
+      )