Raise jsmin to 3.0.0

since 2.2.2 does not exist in py > 3.3

setup.py

@@ -19,7 +19,7 @@ setup(
     zip_safe=False,
     install_requires=[
         'libsass==0.19.4',
-        'jsmin==2.2.2',
+        'jsmin==3.0.0',
         'watchdog==0.10.2'
     ],
     classifiers=[