Prepare for 3.5.0 release (#1250)

* prepare for 3.5.0  release

Author: skarimo

CHANGELOG.md

@@ -1,3 +1,37 @@
+## 3.5.0 (October 25, 2021)
+
+IMPROVEMENTS:
+
+-   `datadog_dashboard`: Implement support for APM Dependency Stats query in Query Table ([#1199](https://github.com/DataDog/terraform-provider-datadog/pull/1199))
+-   `datadog_synthetics_test`: Add missing follow redirects option for multistep requests ([#1194](https://github.com/DataDog/terraform-provider-datadog/pull/1194))
+-   `datadog_dashboard`: Implement support for APM Resource Stats query in Query Table ([#1200](https://github.com/DataDog/terraform-provider-datadog/pull/1200))
+-   `datadog_logs_custom_pipeline`: Document how to find pipeline ID for import ([#1220](https://github.com/DataDog/terraform-provider-datadog/pull/1220))
+-   `datadog_security_monitoring_rules`: Add CWS support to terraform provider ([#1222](https://github.com/DataDog/terraform-provider-datadog/pull/1222))
+-   `datadog_dashboard`: Set dashboard resource's widget attribute to Optional ([#1224](https://github.com/DataDog/terraform-provider-datadog/pull/1224))
+-   `datadog_synthetics_test`: Add support for `servername` in Synthetics test request ([#1232](https://github.com/DataDog/terraform-provider-datadog/pull/1232))
+-   `datadog_monitor`: Add support for new renotify options ([#1235](https://github.com/DataDog/terraform-provider-datadog/pull/1235))
+-   `datadog_logs_index`: Use mutex to avoid creating/modifying logs indexes in parallel ([#1245](https://github.com/DataDog/terraform-provider-datadog/pull/1245))
+
+FEATURES:
+
+-   `datadog_webhook`: Add Webhook resource ([#1205](https://github.com/DataDog/terraform-provider-datadog/pull/1205))
+-   `datadog_webhook_custom_variable`: Add Webhook Custom Variable resource ([#1206](https://github.com/DataDog/terraform-provider-datadog/pull/1206))
+-   `datadog_roles`: Add datadog roles data source ([#1240](https://github.com/DataDog/terraform-provider-datadog/pull/1240))
+-   `datadog_monitor_json`: Add datadog monitor json resource ([#1240](https://github.com/DataDog/terraform-provider-datadog/pull/1240))
+
+BUGFIXES:
+
+-   `datadog_synthetics_test`: Document `device_ids` as required for browser type only ([#1216](https://github.com/DataDog/terraform-provider-datadog/pull/1216)) Thanks [@alexjurkiewicz](https://github.com/alexjurkiewicz)
+-   `datadog_synthetics_test`: Fix synthetics browser test `upload-files` step ([#1219](https://github.com/DataDog/terraform-provider-datadog/pull/1219))
+-   `datadog_integration_gcp`: Changed Token URI for GCP Service account ([#1201](https://github.com/DataDog/terraform-provider-datadog/pull/1201)) Thanks [@pbrao08](https://github.com/pbrao08)
+-   `datadog_downtime`: Set only one of timestamp or date format for start and end to avoid inconsistent plans ([#1223](https://github.com/DataDog/terraform-provider-datadog/pull/1223))
+-   `datadog_security_monitoring_rules`: Fix docs and example for security monitoring default rule ([#1246](https://github.com/DataDog/terraform-provider-datadog/pull/1246))
+-   `datadog_logs_index`: Specify 1 filter block ([#1247](https://github.com/DataDog/terraform-provider-datadog/pull/1247)) Thanks [@bendrucker](https://github.com/bendrucker)
+
+NOTES:
+
+-   Update Datadog client to [v1.5.0](https://github.com/DataDog/datadog-api-client-go/releases/tag/v1.5.0)
+
 ## 3.4.0 (September 16, 2021)
 
 IMPROVEMENTS: