Publish roadmap.

Author: PiotrSikora

TODO.md

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+Features that sooner or later will be added to `ngx_cache_purge`:
+
+* Add support for alternative in-location cache purges using specified
+  request method, with following configuration syntax:
+
+      location / {
+          proxy_pass         http://127.0.0.1:8000;
+          proxy_cache        tmpcache;
+          proxy_cache_key    $uri$is_args$args;
+          proxy_cache_purge  DELETE from 127.0.0.1;
+      }
+
+  This will allow for purges using:
+
+      curl -X DELETE http://example.com/logo.jpg
+
+  instead of:
+
+      curl http://example.com/purge/logo.jpg
+
+
+Features that __will not__ be added to `ngx_cache_purge`:
+
+* Support for prefixed purges (`/purge/images/*`).  
+  Reason: Impossible with current cache implementation.
+
+* Support for wildcard/regex purges (`/purge/*.jpg`).  
+  Reason: Impossible with current cache implementation.