Update setup.cfg for changes in d37197c, fix #68.

setup.cfg

@@ -29,10 +29,14 @@ classifiers =
     Topic :: Desktop Environment :: File Managers
 
 [options]
-packages = send2trash
+packages = find:
 tests_require = pytest
 python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*
 
+[options.packages.find]
+include=
+    send2trash*
+
 [options.extras_require]
 win32 = pywin32; sys_platform == "win32"
 objc = pyobjc-framework-Cocoa; sys_platform == "darwin"