3.0 branch

Author: carl-adams-planet

RELEASE-PLANNING-3.0.md

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+# Planet Python Client 3.0 Release Planning
+
+* Authentication changes:
+  * Migrate to OAuth2 based authentication mechanisms, leveraging the
+    [planet-auth-python](https://github.com/planetlabs/planet-auth-python)
+    library for implementation.
+  * Deprecate use of the legacy authentication protocol and handling of the
+    user's password.
+  * CLI changes to support changes in authentication practices.
+  * Support for API keys supplied by the user is maintained, but users should
+    be aware that there are currently no plans for sentinel-hub.com APIs to
+    support Planet API keys.  The longer term roadmap is for all APIs to work
+    with OAuth service accounts.