chore: release 3.1.0 (#89)

* updated CHANGELOG.md [ci skip]

* updated README.md [ci skip]

Author: release-please[bot]

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this
 project adheres to [Semantic Versioning](http://semver.org/).
 
+## [3.1.0](https://www.github.com/terraform-google-modules/terraform-google-sql-db/compare/v3.0.0...v3.1.0) (2020-02-11)
+
+
+### Features
+
+* Update google and google-beta provider versions to ~>3.5 ([#87](https://www.github.com/terraform-google-modules/terraform-google-sql-db/issues/87)) ([706b173](https://www.github.com/terraform-google-modules/terraform-google-sql-db/commit/706b173e9a4f586e50f306fa055aad4e337e7b69))
+
 ## [Unreleased]
 
 ## [3.0.0] - 2019-12-17