Only install futures if below python3

Author: carlvitzthum

aws_lambda/_version.py

@@ -1,4 +1,4 @@
 """Version information."""
 
 # The following line *must* be the last in the module, exactly as formatted:
-__version__ = "0.11.0"
+__version__ = "0.11.1"

requirements.txt

@@ -2,7 +2,6 @@ botocore==1.10.42
 boto3==1.7.42
 click==6.6
 docutils==0.14
-futures==3.0.5
 jmespath==0.9.4
 pyaml==15.8.2
 python-dateutil==2.8.0

setup.py

@@ -11,6 +11,10 @@
     requirements = f.read().splitlines()
 pip_requirements = [r.strip() for r in requirements]
 
+# Only install futures package if using a Python version <= 2.7
+if sys.version_info < (3, 0):
+    pip_requirements.append('futures==3.0.5')
+
 pkg_version = open("aws_lambda/_version.py").readlines()[-1].split()[-1].strip("\"'")
 
 test_requirements = [