Update change log for 0.2.1

In commit a1ca197 the version was supposed to be bumped to 0.2.0 but
was set to 0.2.1 instead.

The 0.2.0 tag was already pushed, so it can't be fixed now.

Make 0.2.1 instead with the couple of documentation fixes that have
been added since.

Change-Id: I70afb0de3124c03d957a8be0d54cabcceb5be9b8
Bump requests version up to 2.0.1

Change-Id: I60d31b86a8df2e5cb785f367140de4567ff32e10
Bump to requests 2.0.1 also in setup.py

Change-Id: I41828e0c181b53604ef84f423267f1c45ca6d7b4
Fix NameError in REST API example

Change-Id: Ia72639e9579e6a438b520b50a799f18184de206b
Add method to get username and Gerrit version

If the username is not given in the constructor, it is detected
from the ssh config.

Add a method that allows the client to get the detected username
that was used to connect to Gerrit.

Change-Id: I15747d1446b07ce6b250f294fe72842a1be50a6c
Add method to run a gerrit command from the client

Change-Id: If1863c06619a11f93efc7c25c7c33c749950d6a5
Add username field in the account data

Change-Id: I91b90d26fde775d5d58ee127fd9015757090a978
Simplify REST API error handling

Remove GerritRestAPIError.  Raise requests.HTTPError when a request
results in an HTTP Error.  Raise ValueError in other places.

Change-Id: I25188f64161a6ca8159e7777e3f288f775463c25
Handle errors in REST API example

Change-Id: I0fc676f74f6e41c25d7f9f8a504e6a507a5bb43a
Always set sortkey in Change object

The from_json method returns None if the key does not exist
in the json data, so we don't need to check for existence of
the key when constructing the object.

This also ensures that the constructed object has a sortkey
member.

Change-Id: Ic342f8b25aeded0e999f93fa29190853354c57f0
Include change status in Change object

Change-Id: I188e4cc116878cdd6679e45bf3ee545b20ce974e
Add support for CurrentPatchSet

The "currentPatchset" field of the query results includes information
about the review label scores.

Change-Id: I41d54225284e15b2b61b79bfaa309cd5c2b4b86a
Add user in the Approval object

Include the account information for the user who gave the
approval.

Change-Id: I3857c9913c38a5c5223111274314e107f4c81090
Release notes for 0.2.2

Change-Id: I57db6ab987ac604134267ccc79ec4451a0119841
Bump version to 0.2.2

Change-Id: I32b970452809d31037ad15783d2f50e894e530ed