v0.0.20

ngx_php7 0.0.20 changes: 17 Oct 2019

* Add directive php_set, php_rewrite, php_access, php_content, php_log, 
php_header_filter, php_body_filter and php_body_filter.

* Add impl ngx_cookie_set, ngx_cookie_get, ngx_cookie_get_all.

* Add impl ngx_msleep.

* Add redis non-block driver.

* Fixed remove time event and usage of read event.

* Fixed in mysql driver more than double query will fail. Should be reset.

* Fixed ngx_php tcp socket timeout.