Updated to more appropriate 1.9.0 (#1884)

Author: TeslaDethray

CHANGELOG.md

@@ -1,7 +1,7 @@
 # Change Log
 All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org)
 
-## 1.8.2 - 2018-09-11
+## 1.9.0 - 2018-09-11
 ### Added
 - Added a `hide_git_mode_warning` option to disable the warning presented when users run Drush or WP-CLI commands on Pantheon sites that are in git mode.  (#1882)
 

config/constants.yml

@@ -7,7 +7,7 @@
 ---
 
 # App
-TERMINUS_VERSION: '1.8.2'
+TERMINUS_VERSION: '1.9.0'
 
 # Connectivity
 TERMINUS_HOST:     'terminus.pantheon.io'