Bump version, update README and CHANGELOG

Author: Temikus

CHANGELOG.md

@@ -6,6 +6,35 @@ This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html
 
 ## Next
 
+## 1.9.0
+
+### User-facing
+
+#### Added
+
+- \#442 Add support for Application Default credentials [mavin]
+  - This change allows the use of Application Default Credentials so that end 
+    users can authenticate without a service account for development, testing,
+    and one-off interactions by using `:google_application_default`client 
+    option. See README for more details.
+
+### Fixed
+
+- \#444 Remove deprecated `google_client_email` option from client parameters 
+  [temikus]
+- \#446 Updating service parameters to avoid "unrecognised parameter" warnings
+  when initializing Fog client with application default auth [temikus]
+
+### Development changes
+
+#### Fixed
+
+- \#441 Update CI pipeline to Concourse V4 [temikus]
+- \#444 Rework client authentication workflow [temikus]
+  - Separate different auth streams into private helper methods
+  - Add a fallback auth option - Google Application Default credentials
+  - Minor fixes and performance optimizations
+
 ## 1.8.2
 
 ### User-facing

README.md

@@ -94,6 +94,20 @@ cat .fog.example >> ~/.fog # appends the sample configuration
 vim ~/.fog                 # edit file with yout config
 ```
 
+As of `1.9.0` fog-google supports Google [application default credentials (ADC)](https://cloud.google.com/docs/authentication/production) 
+The auth method uses [Google::Auth.get_application_default](https://www.rubydoc.info/gems/googleauth/0.6.7/Google%2FAuth.get_application_default)
+under the hood.
+
+Example workflow for a GCE instance with [service account scopes](https://cloud.google.com/compute/docs/access/create-enable-service-accounts-for-instances)
+defined: 
+
+```
+> connection = Fog::Compute::Google.new(:google_project => "my-project", :google_application_default => true)
+=> #<Fog::Compute::Google::Real:32157700...
+> connection.servers
+=> [  <Fog::Compute::Google::Server ...  ]
+```
+
 #### SSH-ing into instances
 
 If you want to be able to bootstrap SSH-able instances, (using `servers.bootstrap`,) be sure you have a key in `~/.ssh/id_rsa` and `~/.ssh/id_rsa.pub`

lib/fog/google/version.rb

@@ -1,5 +1,5 @@
 module Fog
   module Google
-    VERSION = "1.8.2".freeze
+    VERSION = "1.9.0".freeze
   end
 end