Small license changes (acknowledge individual contributors).

COPYRIGHT → LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2009, Alex Gaynor
+Copyright (c) Alex Gaynor and individual contributors.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without 

README.rst

@@ -54,33 +54,5 @@ Support
 If you have questions about usage or development you can join the
 `mailing list`_.
 
-License
--------
-
-Copyright (c) 2009-2012, Alex Gaynor
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without 
-modification, are permitted provided that the following conditions are met:
-
- * Redistributions of source code must retain the above copyright notice, this 
-   list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright notice, 
-   this list of conditions and the following disclaimer in the documentation 
-   and/or other materials provided with the distribution.
- * The names of its contributors may not be used to endorse or promote products 
-   derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
 .. _`read the docs`: https://django-filter.readthedocs.org/en/latest/
 .. _`mailing list`: http://groups.google.com/group/django-filter