Bumped up the version number

CHANGES.rst

diff --git a/CHANGES.rst b/CHANGES.rst
index 63a7d3b..6405445 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,5 +1,5 @@
-UNRELEASED
-==========
+3.4.0
+=====
 
 - Backported bpo-21423: Add an initializer argument to {Process,Thread}PoolExecutor
   (only ThreadPoolExecutor for now; PR by Fahrzin Hemmati)

setup.py

diff --git a/setup.py b/setup.py
index 510f793..f9d02ae 100755
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@
     readme = f.read()
 
 setup(name='futures',
-      version='3.3.0',
+      version='3.4.0',
       description='Backport of the concurrent.futures package from Python 3',
       long_description=readme,
       author='Brian Quinlan',