master (unreleased)
* Added feature: http2 support. Thanks to Frankie Dintino.

Version 2.2.1
 * Added feature: SHA-256 and SHA-512

Version 2.2.0
 * Added feature: resumable uploads
 * Added feature: allow to use of $variables in "upload_pass" directive (Piotr Sikora)
 * Added feature: allow module's directives inside if statements (David Backeus)
 * Added feature: directive upload_tame_arrays and ability to do some magic with php arrays

Version 2.0.12
 * Fixed bug: keepalive connection was hanging after upload has been completed.
 * Change: if request method is not POST return HTTP 405 in order to simplify configuration.

Version 2.0.11
 * Fixed bug: rb->buf was uninitiazlied at some execution paths. Found by Andrew Filonov.
 * Fixed bug: dummy field would not appear whenever form contains only non-file fields.
 * Added feature: variable $upload_file_number which indicates ordinal number
 of file in request
 * Change: compatibility with nginx API 0.8.25 and greater

Version 2.0.10
 * Change: compatibility with nginx API 0.8.11
 * Fixed bug: Prevent module from registering store path if no upload location
 was configured
 * Fixed bug: upload corrupted in case of short body + keepalive. Thanks to Dmitry
 Dedukhin.
 * Change: Return error 415 instead of 400 if request content type is not
 multipart/form-data

Version 2.0.9
 * Change: compatibility with nginx's API 0.7.52 and greater
 * Fixed bug: module directives couldn't have appeared in limit_except block
 * Added feature: directive upload_limit_rate and ability to limit upload rate
 * Change: Malformed body issues are now logged to error log instead of debug log

Version 2.0.8
 * Change: support for named locations
 * Fixed bug: crash on missing Content-Type request header
 * Fixed bug: compilation problem on amd 64

Version 2.0.7
 * Change: file size and output body size restrictions
 * Added feature: directive upload_pass_args enables forwarding
   of request arguments to a backend. Thanks to Todd Fisher.

Version 2.0.6
 * Fixed bug: zero variables in aggregate field name caused allocation
   of random amount of memory. Thanks to Dmitry Dedukhin.
 * Fixed bug: Prevent generation of a field in case of empty field name

Version 2.0.5
 * Fixed bug: prevent leaking of file descriptors on a timeout (unconfirmed problem).
 * Fixed bug: variables in field values in upload_set_form_field and
   upload_aggregate_form_field directives were not working if field name
   contained 0 variables. 
 * Added feature: directive upload_cleanup now specifies statuses,
   which initiate removal of uploaded files. Used for cleanup after
   failure of a backend.
 * Added feature: aggregate variable upload_file_crc32 allows to calculate
   CRC32 if file on the fly.
 * Fixed bug: Indicator of necessity to calculate SHA1 sum was not inheritable
   from server configuration.

Version 2.0.4
 * Fixed bug: location configuration of upload_set_form_field and upload_pass_form_field
   was not inheritable from server configuration.
 * Added feature: directive upload_aggregate_form_field to pass aggragate properties
   of a file like file size, MD5 and SHA1 sums to backend.
 * Fixed bug: missing CRLF at the end of resulting body.
 * Change: optimized out some unnecessary memory allocations and zeroing.

Version 2.0.3
 * upload_store directive was not able to receive more than one argument.
   As a result no hashed dirs for file uploads were possible.
 * upload_store_access directive did not work at all. Permissions were
   defaulted to user:rw. Thanks to Brian Moran.
 * In case of any errors at the last chunk of request body only 500 Internal Server Error
   was generated intead of 400 Bad Request and 503 Service Unavailable.
 * Fixed copyrights for temporary file name generation code
 * Fixed compilation issue on 0.6.32. Thanks to Tomas Pollak.
 * Added directive upload_pass_form_field to specify fields
   to pass to backend. Fixes security hole found by Brian Moran.

Version 2.0.2
 * Fixed crash in logging filename while aborting upload
 * Added feasible debug logging
 * Added support for variables to generate form fields
   in resulting request body
 * Added missing logging of errno after write failures
 * Simplified upload abortion logic; simply discarding
   already added fields
 * Now returning explicit error code after script failures
   to be able to generate Internal server error