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add ChangeLog with notes about filter changes

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+==============
+Change history
+==============
+
+.. contents::
+ :local:
+
+.. _version-2.0:
+
+2.0
+===
+:release-date: 2011-07-14
+
+.. _v20-important:
+
+Important Notes
+---------------
+
+* Backwards-incompatible filter changes in the latest 2011 EC2 APIs
+
+ In the latest 2011 EC2 APIs all security groups are assigned a unique
+ identifier (sg-\*). As a consequence, some existing filters which used to take
+ the group name now require the group *id* instead:
+
+ 1. *group-id* filter in DescribeInstances (ie get_all_instances())
+
+ To filter by group name you must instead use the *group-name* filter
+
+ 2. *launch.group-id* filter in DescribeSpotInstanceRequests (ie get_all_spot_instance_requests())
+
+ Unfortunately for now, it is *not* possible to filter spot instance
+ requests by group name; the security group id *must* be used instead.
+
+ This new security group id can be found in the *id* attribute of a boto
+ SecurityGroup instance.
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