Updated NEWS for 0.2.0 release

NEWS

+spdylay 0.2.0
+=============
+
+Release Note
+------------
+
+This release adds several new APIs. The spdylay_gzip API is suitable
+for inflating compressed entity body from the remote endpoint.  The
+spdylay_submit_window_update() is added to send WINDOW_UPDATE frame by
+the application.  The spdylay_session_set_option() is a new function
+to set options to the library. Currently,
+SPDYLAY_OPT_NO_AUTO_WINDOW_UPDATE option is available. If it is set,
+the library does not send WINDOW_UPDATE automatically. The application
+should send WINDOW_UPDATE using spdylay_submit_window_update().  The
+spdylay_strerror() is added and it returns string describing the given
+error code.  The following new callback functions are added:
+spdylay_on_unknown_ctrl_recv_callback and
+spdylay_on_ctrl_recv_parse_error_callbacks. They are useful for
+debugging and logging errors.
+
+Some changes are made to exsiting interfaces.  The status_code
+argument was added to spdylay_on_invalid_ctrl_recv_callback.
+FRAME_TOO_LARGE was renamed as SPDYLAY_FRAME_TOO_LARGE.
+
+spdylay_data_source_read_callback can now return
+SPDYLAY_ERR_TEMPORAL_CALLBACK_FAILURE to signal stream error.
+Previously, this function can only return SPDYLAY_ERR_CALLBACK_FAILURE
+on error, which signals session error.
+
+Since SPDY/3 is now becoming mainline protocol,
+spdylay_select_next_protocol() now prefers spdy/3 to spdy/2.
+
+Some bug fixes are made in flow control and handling max concurrent
+streams.
+
+For example programs, the usage output was cleaned up.  The -w option
+is added to spdycat. This option sets the initial window size bits.
+spdycat and spdyd prefer spdy/3 to spdy/2 from this release.
+
+The pkg-config file now includes zlib in Requires.private.
+
+Changes
+-------
+
+* Renamed index in spdylay_get_credential_cert prototype to idx This
+  is because compiler may warn that name `index` shadows global
+  declaration if the application code uses the prototype argument
+  names as is.
+
+* Bumped up the library version to 1.0.0 because of the API changes.
+
+* Prefer spdy/3 to spdy/2 in spdyd
+
+* Prefer spdy/3 to spdy/2 in spdylay_select_next_protocol()
+
+* spdylay_data_source_read_callback can now return
+  SPDYLAY_ERR_TEMPORAL_CALLBACK_FAILURE to signal stream error.  The
+  existing SPDYLAY_ERR_CALLBACK_FAILURE signals session error.
+
+* Renamed error as error_code in spdylay_on_ctrl_not_send_callback
+  prototype
+
+* Bring back deferred DATA to the outbound queue when SETTINGS with
+  INITIAL_WINDOW_SIZE is received and the window size becomes
+  positive.
+
+* Fixed the bug that spdylay_recv does not return SPDYLAY_ERR_EOF.
+
+* Renamed FRAME_TOO_LARGE as SPDYLAY_FRAME_TOO_LARGE
+
+* Added status_code argument to spdylay_on_invalid_ctrl_recv_callback
+
+* Added spdylay_strerror() public API. It returns string describing
+  the given error code.
+
+* Added spdylay_on_unknown_ctrl_recv_callback.  This callback function
+  is invoked when the unknown frame type is received.  Added debug
+  output using this callback to spdycat.
+
+* Added spdylay_on_ctrl_recv_parse_error_callback.  This callback
+  function is invoked when the received frame data could not be parsed
+  correctly.  Added debug output using this callback to spdycat.
+
+* Added spdylay_submit_window_update() public API.
+
+* Added spdylay_session_set_option() public API. Currently,
+  SPDYLAY_OPT_NO_AUTO_WINDOW_UPDATE option is available. If it is set,
+  the library does not send WINDOW_UPDATE automatically. The
+  application should send WINDOW_UPDATE using
+  spdylay_submit_window_update().
+
+* Added -w, --window-bits option to spdycat.  This option sets the
+  initial window size bits.
+
+* Having the number of server and client streams be limited separately
+  using SETTINGS_MAX_CONCURRENT_STREAMS
+
+* Use local_settings' INITIAL_WINDOW_SIZE when deciding to send
+  WINDOW_UPDATE.
+
+* Added spdylay_gzip API. They are suitable for inflating compressed
+  entity body from the remote endpoint.
+
+* Added SPDY client example written in C.
+
+* Added zlib to Requires.private and updated Description