changelog: add changelog 1.4.0 (#1134)

* add changelog 1.4.0

* update description

CHANGELOG/CHANGELOG-1.4.md

@@ -0,0 +1,62 @@
+- [How to try](#how-to-try)
+- [v1.4.0-rc1](#v140-rc1)
+  - [Features](#features)
+  - [Fixes](#fixes)
+
+# v1.4.0-rc1
+
+## Features:
+* [#1062](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1062) Add ingress annotations to customize health probe
+    * `appgw.ingress.kubernetes.io/health-probe-hostname`
+    * `appgw.ingress.kubernetes.io/health-probe-port`
+    * `appgw.ingress.kubernetes.io/health-probe-path`
+    * `appgw.ingress.kubernetes.io/health-probe-status-codes`
+    * `appgw.ingress.kubernetes.io/health-probe-interval`
+    * `appgw.ingress.kubernetes.io/health-probe-timeout`
+    * `appgw.ingress.kubernetes.io/health-probe-unhealthy-threshold`
+* [#1064](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1064) Allow modifying tolerations and affinities through Helm configuration to AGIC pod
+* [#1084](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1084) Allow adding custom annotatios through helm configuration to AGIC pod
+* [#1130](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1130) Allow modifying security context through helm configuration on AGIC pod
+
+### Miscellaneuos:
+* [#1075](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1075) Moving to RBAC Api version `rbac.authorization.k8s.io/v1`
+* [#1080](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1080) Log ARM operation ID in AGIC logs after PUT operation on Application Gateway
+* [#1081](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1081) Replace glog with klog for logging
+* [#1082](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1082) Add a unique identifier in User Agent for ARM requests
+
+## Fixes:
+* [#1070](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1070) Fix secret and ingress handlers to handle case where secret is created as empty and repopulated later
+* [#1073](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1073) Small adjustment in the values.yaml template to generate the artifact correctly
+* [#1090](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1090) Fix backend pool processing to `continue` instead of `break` when an error condition is encountered in services
+* [#1123](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1123) Remove tag LastUpdatedByK8sIngress
+* [#1125](https://github.com/Azure/application-gateway-kubernetes-ingress/pull/1125) Generate default listener with private ip when specified in helm
+
+
+## How to try:
+```bash
+# upgrade to the latest release version 1.4.0-rc1
+helm repo update
+helm install \
+  <release-name> \
+  -f helm-config.yaml \
+  application-gateway-kubernetes-ingress/ingress-azure
+
+# use --version 1.4.0-rc1 when installing/upgrading using helm
+helm repo update
+helm install \
+  <release-name> \
+  -f helm-config.yaml \
+  application-gateway-kubernetes-ingress/ingress-azure \
+  --version 1.4.0-rc1
+
+# or 
+
+# https://github.com/Azure/application-gateway-kubernetes-ingress/blob/master/docs/how-tos/helm-upgrade.md
+# --reuse-values   when upgrading, reuse the last release's values and merge in any overrides from the command line via --set and -f. If '--reset-values' is specified, this is ignored
+helm repo update
+helm upgrade \
+  <release-name> \
+  application-gateway-kubernetes-ingress/ingress-azure \
+  --reuse-values \
+  --version 1.4.0-rc1
+```