Replace deprecatd pkgutil with importlib.

Author: AspRobot

setup.py

@@ -4,7 +4,7 @@
 # Copyright (c) 2015, Ayun Park. All rights reserved.
 # For licensing, see LICENSE file included in the package.
 import sys
-import pkgutil
+import importlib.util
 from setuptools import setup
 from setuptools.command.install import install
 
@@ -13,9 +13,7 @@ class NewInstall(install):
 
     @staticmethod
     def check_pymongo():
-        if pkgutil.find_loader('pymongo'):
-            return True
-        return False
+        return importlib.util.find_spec('pymongo')
 
     def run(self):
         install.run(self)