prepare 0.2.1 release

Author: chfw

CHANGELOG.rst

@@ -1,15 +1,31 @@
 Change log
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-0.2.1 - unreleased
+0.22 - unreleased
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 Updated
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-#. Attention, user of pyexcel-io! No longer io stream validation is performed in python 3. The guideline is: io.StringIO for csv, tsv only, otherwise BytesIO for xlsx, xls, ods. You can use RWManager.get_io to produce a correct stream type for you.
+#. `#19 <https://github.com/pyexcel/pyexcel-io/issues/19>`__, use cString by default
+
+0.2.1 - 09.07.2016
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+
+
+Added
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+
 #. csv format: handle utf-16 encoded csv files. Potentially being able to decode other formats if correct "encoding" is provided
+#. csv format: write utf-16 encoded files. Potentially other encoding is also supported
+#. support stdin as input stream and stdout as output stream
+
+Updated
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+#. Attention, user of pyexcel-io! No longer io stream validation is performed in python 3. The guideline is: io.StringIO for csv, tsv only, otherwise BytesIO for xlsx, xls, ods. You can use RWManager.get_io to produce a correct stream type for you.
+#. `#15 <https://github.com/pyexcel/pyexcel-io/issues/15>`__, support foreign django/sql foreign key
+   
 0.2.0 - 01.06.2016
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