Update README.md

Added description for multiple dns name

Added a reference to a blogpost which uses ExternalDNS in a CI/CD setup.

Clarify that hosted zone identifier is to be used

Changelog for v0.5.11

Document make dep step which may be needed to run make build

This PR is a comment about "Multiple DNS names per Service" setting.

Fixed PowerDNS Domain Filter Bug

allow hostname annotations to be ignored

* When using Domain Filters with PowerDNS provider and providing
  no domain filter, the provider ignores all zones instead of
  including all zones which is the default behaviour
* Added test cases for PartitionZones function of PDNSClient

Fixed typo in debug output

fix test of ProviderSpecific comparison

Signed-off-by: Joe Hohertz <joe@viafoura.com>

Ignore AWS EvaluateTargetHealth when detecting plan changes

Reduce number of API requests by caching a bit

only compare provider-specific annotations when they exist in the provider, skip target-health annotation

Fixes some style in the faq.md file

Cloudflare pagination for zones

Pagination cloudflare zones

Update changelog for v0.5.10

Remove linki from SECURITY_CONTACTS

Update cloudflare.go

As per responsibilities of a security contact: https://github.com/kubernetes/sig-release/blob/master/security-release-process-documentation/security-release-process.md#responsibilities

Improve documentation regarding Alias

Allow setting Cloudflare proxying on a per-ingress basis

I got stuck here and opened #865 because I thought it was a bug. I hope this will help others set it up correctly the first time.