Release 9 13 0 (#781)

* Release 9.13.0

* Update release notes

Author: KazuCocoa

CHANGELOG.md

@@ -10,6 +10,15 @@ Release tags are https://github.com/appium/ruby_lib/releases .
 
 ### 3. Deprecations
 
+## v9.13.0
+### 1. Enhancements
+- Requires `appium_lib_core` 1.6.0+
+    - Breaking change for `app_state`: https://github.com/appium/ruby_lib_core/blob/master/CHANGELOG.md#160---2018-05-08
+
+### 2. Bug fixes
+
+### 3. Deprecations
+
 ## v9.12.1
 ### 1. Enhancements
 - Support `start_logs_broadcast` and `stop_logs_broadcast` for iOS

appium_lib.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.homepage      = 'https://github.com/appium/ruby_lib' # published as appium_lib
   s.require_paths = ['lib']
 
-  s.add_runtime_dependency 'appium_lib_core', '~> 1.5.0'
+  s.add_runtime_dependency 'appium_lib_core', '~> 1.6.0'
   s.add_runtime_dependency 'tomlrb', '~> 1.1'
   s.add_runtime_dependency 'nokogiri', '~> 1.8', '>= 1.8.1'