Bumped to 1.9.0 and updated UPGRADING.md

Author: schinery

CHANGELOG.md

@@ -1,14 +1,19 @@
-### 1.8.1 (Next)
+### 1.9.1 (Next)
 
 #### Features
 
-* [#2353](https://github.com/ruby-grape/grape/pull/2353): Added Rails 7.1 support - [@ericproulx](https://github.com/ericproulx).
-* [#2355](https://github.com/ruby-grape/grape/pull/2355): Set response headers based on Rack version - [@schinery](https://github.com/schinery).
 * Your contribution here.
 
 #### Fixes
 
 * Your contribution here.
+* 
+### 1.9.0 (2023/10/18)
+
+#### Features
+
+* [#2353](https://github.com/ruby-grape/grape/pull/2353): Added Rails 7.1 support - [@ericproulx](https://github.com/ericproulx).
+* [#2355](https://github.com/ruby-grape/grape/pull/2355): Set response headers based on Rack version - [@schinery](https://github.com/schinery).
 
 ### 1.8.0 (2023/08/30)
 

README.md

@@ -160,9 +160,9 @@ content negotiation, versioning and much more.
 
 ## Stable Release
 
-You're reading the documentation for the next release of Grape, which should be **1.8.1**.
+You're reading the documentation for the next release of Grape, which should be **1.9.1**.
 Please read [UPGRADING](UPGRADING.md) when upgrading from a previous version.
-The current stable release is [1.8.0](https://github.com/ruby-grape/grape/blob/v1.8.0/README.md).
+The current stable release is [1.9.0](https://github.com/ruby-grape/grape/blob/v1.9.0/README.md).
 
 
 ## Project Resources

UPGRADING.md

@@ -1,6 +1,20 @@
 Upgrading Grape
 ===============
 
+### Upgrading to >= 1.9.0
+
+#### Response Headers
+
+For Rack >= 3 the following response headers are returned lowercase:
+
+* `content-type`
+* `x-cascade`
+
+For Rack < 3 the following response headers are returned capitalized:
+
+* `Content-Type`
+* `X-Cascade`
+
 ### Upgrading to >= 1.7.0
 
 #### Exceptions renaming

lib/grape/version.rb

@@ -2,5 +2,5 @@
 
 module Grape
   # The current version of Grape.
-  VERSION = '1.8.1'
+  VERSION = '1.9.0'
 end