Update CHANGELOG.md

[ci skip]
For visual sanity, no versioning or releases needed.
make sure proxy is not used when instance_id is queried
force proxy off for metadata queries
Add ability to enable detailed CloudWatch monitoring for the current instance.
update README with volume_type for gp2, fix minor text items in CHANGELOG
Added support for provisioning General Purpose (SSD) volumes (gp2)
Version bump to 2.3.0
Publish 2.3.0 Changelog
Version bump to 2.3.1 (for development)
Merge pull request #64 from namtzigla/master

force proxy off for metadata queries
adding to CHANGELOG and bumping metadata
adding test-kitchen skeleton
Merge pull request #60 from miketheman/patch-1

Update CHANGELOG.md
Adding a starting point for testing aws cookbook
Adds ubuntu and elastic_ip tests
Adds elb tests
Add a check for the resource_tag
Add a test for s3_file
Merge pull request #85 from opscode-cookbooks/cwebberOps/testing_improvements

Adding a starting point for testing aws cookbook
Add ec2 hints recipe