Hetzner DNS service support

Add OVH API rate limiting option (Fix #1546)

Add kustomize base

Signed-off-by: Raffaele Di Fazio <difazio.raffaele@gmail.com>

increase test timeout to fix intermittent failures of ingress tests

AWS: change the order of the actions, DELETE before CREATE fixes #1411

Fix handling of DNS updates for RFC2136 provider.

digitalocean: increase API page size

improve linter quality for external-dns

When receiving an update, we should be removing the old record and
adding the new.  Previously, we were removing and readding the new
record, which would cause the old DNS record to be left lying around.

fix convert int to string bug

* add initial changelog
Signed-off-by: Raffaele Di Fazio <difazio.raffaele@gmail.com>

* updated changelog
Signed-off-by: Raffaele Di Fazio <raffo@github.com>

Allow for custom property comparators

Update README.md

Co-authored-by: Raffaele Di Fazio <raffo@github.com>

Co-authored-by: Raffaele Di Fazio <raffo@github.com>

I've changed the URL to the blogpost mentioned in the `Readme.md`
I'm moving all my posts from medium to a personal hosted website. 

(same article, different url)