Disable conversion of HEAD method to GET #89
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This PR disables the conversion of request method HEAD to GET when caching applies. As the documentation at http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_convert_head suggests, the cache key is extended with the method.
In order to not invalidate existing caches, I decided to keep the cache keys for GET as they are. Only HEAD requests will use a "HEAD:" prefix. This could be cleaned up later when a breaking change needs to be made anyway (e.g., why don't we have the FQDN or registry name in the cache key?).