Added release notes for upcoming 2.3.0 release (#904)

Jacob Wenger · web-flow · commit 05a81500f5df · 2017-01-23T09:48:16.000-08:00
diff --git a/changelog.txt b/changelog.txt
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+feature - Added a new [`$firebaseStorage`](/docs/guide/uploading-downloading-binary-content.md) service to store and retrieve user-generated content like images, audio, and video.

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	`1`	+feature - Added a new [`$firebaseStorage`](/docs/guide/uploading-downloading-binary-content.md) service to store and retrieve user-generated content like images, audio, and video.