Add __ne__ method to Requirement class

It seems like if it has an `__eq__` method, it should probably have a `__ne__` method.

I ran into this while working on pip -- see https://github.com/pypa/pip/pull/2493#discussion_r25955295

1 files changed, 3 insertions, 0 deletions

diff --git a/pkg_resources/__init__.py b/pkg_resources/__init__.py
index 2ce663d2..7701292b 100644
--- a/pkg_resources/__init__.py
+++ b/pkg_resources/__init__.py
@@ -2907,6 +2907,9 @@ class Requirement:
             self.hashCmp == other.hashCmp
         )
 
+    def __ne__(self, other):
+        return not self == other
+
     def __contains__(self, item):
         if isinstance(item, Distribution):
             if item.key != self.key: