docs(git): add changelog

[njhale]

After some digging, I noticed that projects like etcd and kubernetes make use of a CHANGELOG.md file as the primary source of info for GH releases. Some supplemental googling lead to a wealth of info on the matter (https://keepachangelog.com/en/1.0.0/ and https://github.com/olivierlacan/keep-a-changelog/blob/master/CHANGELOG.md) and even a tool for generating changelogs.

This PR contains the output of github-changelog-generator - Let me know if we can use this as-is, or if the output needs to be better curated.

[njhale]

Also, the tool used to generate this assigns content to a header based on labels. This means that we can label merged PRs with labels such as "bug" and they will be listed under the "Fixed Bugs" header. It also has options for custom headers and tags.

[alecmerdler]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[njhale]

/retest

[ecordell]

/retest

…

On Tue, Mar 19, 2019 at 6:10 PM OpenShift CI Robot ***@***.***> wrote: @njhale <https://github.com/njhale>: The following tests *failed*, say /retest to rerun them all: Test name Commit Details Rerun command ci/prow/e2e-aws-olm e203e5d <e203e5d> link <https://openshift-gce-devel.appspot.com/build/origin-ci-test/pr-logs/pull/operator-framework_operator-lifecycle-manager/765/pull-ci-operator-framework-operator-lifecycle-manager-master-e2e-aws-olm/1322> /test e2e-aws-olm ci/prow/e2e-aws 421ba55 <421ba55> link <https://openshift-gce-devel.appspot.com/build/origin-ci-test/pr-logs/pull/operator-framework_operator-lifecycle-manager/765/pull-ci-operator-framework-operator-lifecycle-manager-master-e2e-aws/1561> /test e2e-aws Full PR test history <https://openshift-gce-devel.appspot.com/pr/operator-framework_operator-lifecycle-manager/765>. Your PR dashboard <https://openshift-gce-devel.appspot.com/pr/njhale>. Please help us cut down on flakes by linking to <https://github.com/kubernetes/community/blob/master/contributors/devel/flaky-tests.md#filing-issues-for-flaky-tests> an open issue <https://github.com/operator-framework/operator-lifecycle-manager/issues?q=is:issue+is:open> when you hit one in your PR. Instructions for interacting with me using PR comments are available here <https://git.k8s.io/community/contributors/guide/pull-requests.md>. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra <https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:> repository. I understand the commands that are listed here <https://go.k8s.io/bot-commands>. — You are receiving this because your review was requested. Reply to this email directly, view it on GitHub <#765 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AADix7BYcMIL8HyHaFOJ4sxdLefA6wQsks5vYWA1gaJpZM4b7PE1> .

[openshift-ci-robot]

New changes are detected. LGTM label has been removed.

[njhale]

/retest

[njhale]

/retest

[openshift-ci-robot]

@njhale: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-olm	4706c77	link	/test e2e-aws-olm
ci/prow/e2e-aws	4706c77	link	/test e2e-aws

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.