Updated README.md and added release-notes/v0.9.0.md

README.md

@@ -61,8 +61,15 @@ When automated testing is this much fun, teams can easily protect
 themselves from costly regressions.
 
 ## Install
+```
+go get github.com/cucumber/godog/cmd/godog@v0.9.0
+```
+Adding `@v0.9.0` will install v0.9.0 specifically instead of master.
 
-    go get github.com/cucumber/godog/cmd/godog
+Running `within the $GOPATH`, you would also need to set `GO111MODULE=on`, like this:
+```
+GO111MODULE=on go get github.com/cucumber/godog/cmd/godog@v0.9.0
+```
 
 ## Example
 

godog.go

@@ -39,4 +39,4 @@ Godog was inspired by Behat and Cucumber the above description is taken from it'
 package godog
 
 // Version of package - based on Semantic Versioning 2.0.0 http://semver.org/
-const Version = "v0.8.1"
+const Version = "v0.9.0"

release-notes/v0.9.0.md

@@ -0,0 +1,65 @@
+I am excited to announce the release of godog v0.9.0.
+
+Here follows a summary of notable changes, and the non backward compatible changes.
+The full change log is available [here](https://github.com/cucumber/godog/blob/master/CHANGELOG.md).
+
+
+Notable Changes
+----------------
+
+Most importantly, note that the gherkin core is changed to [gherkin-go](https://github.com/cucumber/gherkin-go/releases/tag/v9.2.0).
+
+
+
+Non backward compatible changes
+-------------------------------
+
+### Install godog
+With the change of dependencies for godog, which relies on `go modules`, installing godog now requires go modules to be active.
+
+If you are running `within the $GOPATH`, you would need to install godog like this:
+`GO111MODULE=on go get github.com/cucumber/godog/cmd/godog@v0.9.0`
+- Adding `GO111MODULE=on` will allow go get and go mod to work together as intended.
+- Adding `@v0.9.0` will install v0.9.0 specifically instead of master.
+
+If you are running `outside of the $GOPATH`, you should still specify a version.
+
+
+### Gherkin Core
+The following types have been switched for [messages-go](https://github.com/cucumber/messages-go).
+
+|           old           |                     new                     |
+| ----------------------- | ------------------------------------------- |
+| gherkin.Feature         | messages.GherkinDocument                    |
+| gherkin.Scenario        | messages.Pickle                             |
+| gherkin.ScenarioOutline | messages.Pickle                             |
+| gherkin.Step            | messages.Pickle_PickleStep                  |
+| gherkin.DocString       | messages.PickleStepArgument_PickleDocString |
+| gherkin.DataTable       | messages.PickleStepArgument_PickleTable     |
+
+
+### Step Defintions
+- `StepDef` has been renamed to `StepDefinition`
+- Steps that earlier accepted `*gherkin.DocString` or `*gherkin.DataTable` needs to be updated to use `*messages.PickleStepArgument_PickleDocString` resp. `*messages.PickleStepArgument_PickleTable`.
+[Example](https://github.com/cucumber/godog/pull/240/files#diff-a5f59d298843b731ff8d2f9c670303ff).
+
+
+### Hooks
+The updated hooks can be found [here](https://github.com/cucumber/godog/blob/b62eb13ee70c9f0f732b694b39bde9670051bac7/suite.go#L251).
+- `BeforeFeature` and `AfterFeature` hooks now accept `*messages.GherkinDocument` instead of `*gherkin.Feature`
+- `BeforeScenario` and `AfterScenario` hooks now accept `*messages.Pickle` instead of `interface{}`
+- `BeforeStep` and `AfterStep` hooks now accept `*messages.Pickle_PickleStep` instead `*gherkin.Step`
+
+
+### Formatter
+The formatter interface have recieved some updates, the updated version can be found [here](https://github.com/cucumber/godog/blob/b62eb13ee70c9f0f732b694b39bde9670051bac7/fmt.go#L100).
+
+- `Feature` now accepts `*messages.GherkinDocument` instead of `*gherkin.Feature`
+- `Node` has been renamed to `Pickle` and now accepts `*messages.Pickle` instead of `interface{}`
+- `Defined`, `Failed`, `Passed`, `Skipped`, `Undefined`, `Pending` now takes `*messages.Pickle` as the first argument and `*gherkin.Step, *StepDef` have been updated to `*messages.Pickle_PickleStep, *StepDefinition`
+
+
+Full change log
+---------------
+
+See [CHANGELOG.md](https://github.com/cucumber/godog/blob/master/CHANGELOG.md).