release(v1.6.2): Prepare the release (darkweak#190)

* release(v1.6.2): Prepare the release

feat(configuration): Set enable property optional, default true (dark…

…weak#188)

* feat(configuration): Set enable property optional, default true

* Update documentation

* Deprecate the security endpoint

* Update caddy's README

Prepare v1.6.0 (darkweak#186)

feat(core): default cache control behaviour (darkweak#184)

* Add default_cache_control for core and traefik

* Move adding default Cache-Control header to bridge.go

* Add to core docs

* Add to traefik plugin docs

* Add for Caddy plugin

* Add to Caddy plugin docs

* Add code and docs for Tyk plugin

* Add Caddy plugin docs to top-level README

* Set unit test traefik & caddy configuration to match old behavior

* Fix interface{} is nil error of traefik plugin

* Update without unnecessary assign

* Update README + bump caddy to the next release

* Bump caddy version

* Stable olric container version

* Bump olric version

Co-authored-by: Menci <[email protected]>

fix(plugins): Bump caddy dep to Souin latest (darkweak#175)

feat(metrics): Prometheus support (darkweak#174)

* feat(metrics): Prometheus support

* Bump Træfik

* Bump caddy

* Run prometheus registry during the configuration

* Fix prometheus already started

* Update newman tests

* Update documentation according to the new souin_ prefix on the prometheus metrics

* Add Skipper and Gin E2E

fix(rfc): Handle nil reader and empty response (darkweak#172)

* fix(rfc): Handler nil reader and empty response

* Handle another way inexistent (S)MaxAge props

fix(core): Vary voter election (darkweak#168)

fix(plugins): Traefik custom writer (darkweak#161)

* fix(plugins): Traefik custom writer

* Update and prepare v1.5.11-beta6

Prepare v1.5.11-beta5 (darkweak#160)

* Prepare v1.5.11-beta5

* Update e2e

* Replace the embedded Olric to go-cache to fix issues on start

* Ensure Tyk loads Souin

* Vendor plugins if necessary