v1.0.0-rc.1

• PR #476 - @stefanprodan - build: generate release notes on disk
• PR #475 - @mathetake - refactor tests: simplify assertion
• PR #474 - @stefanprodan - Add Chick-fil-A to user list
• PR #472 - @stefanprodan - Release Flagger v1.0.0-RC.1
• PR #471 - @mathetake - add Flagger user: dmm.com
• PR #469 - @stefanprodan - Add Flagger users to readme
• PR #467 - @stefanprodan - Release loadtester v0.13.0
• PR #464 - @mathetake - pkg/metrics/providers: add AWS CloudWatch provider
• PR #463 - @stefanprodan - Rename spec.canaryAnalysis to spec.analysis
• PR #462 - @stefanprodan - ci: push container for master only
• PR #461 - @mathetake - docs: add maintainer: @mathetake
• PR #460 - @mathetake - feature: add datadog metrics provider
• PR #457 - @stefanprodan - Update docs for Flagger v1beta1 API
• PR #455 - @mathetake - feat: Support daemonset target kind
• PR #454 - @stefanprodan - e2e: Update Contour to v1.2
• PR #450 - @stefanprodan - Add docs for Istio multi-cluster setup
• PR #449 - @ta924 - add support for rollback gating for loadtester
• PR #448 - @stefanprodan - docs: Add development and release guide
• PR #447 - @viditganpi - Add support for Istio multi-cluster
• PR #446 - @stefanprodan - Fix spec changes detection
• PR #442 - @stefanprodan - Use header operations in Istio router
• PR #441 - @stefanprodan - Extend Istio traffic policy
• PR #440 - @stefanprodan - SMI TrafficSplit v1alpha2 client
• PR #438 - @stefanprodan - Update e2e tests and docs
• PR #436 - @stefanprodan - Set destination port for Istio ingress gateways
• PR #433 - @stefanprodan - Track projected configmaps and secrets
• PR #430 - @heubeck - Add webhookUrl env parameter
• PR #429 - @stefanprodan - Implement canary alerts and alert providers
• PR #425 - @stefanprodan - Allow disabling secrets/configmaps tracking
• PR #424 - @stefanprodan - Implement metric range validation
• PR #423 - @stefanprodan - crd: Release flagger.app/v1beta1