setup.py: Only require future on Python 2

We only use future for the `builtins` module which is standard in Python 3. Signed-off-by: Anders Kaseorg <[email protected]>
readthedocs · Aug 21, 2019 · f9647d0 · f9647d0
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,5 @@
 ## x.y.z (unreleased)
-- CommonMark now requires `future >= 0.14.0` for uniform `builtins` imports in Python 2/3
+- CommonMark now requires `future >= 0.14.0` on Python 2, for uniform `builtins` imports in Python 2/3
 
 ## 0.9.0 (2019-05-02)
 - The CommonMark spec has been updated to 0.29. Completed by @iamahuman.

diff --git a/setup.py b/setup.py
@@ -53,7 +53,7 @@ def run(self):
     },
     cmdclass={'test': Test},
     install_requires=[
-        'future>=0.14.0',
+        'future>=0.14.0;python_version<"3"',
     ],
     tests_require=tests_require,
     extras_require={'test': tests_require},