Prep for 0.21.9 (#2653)

* Prep for 0.21.9 * Update NEWS.md
jump-dev · Aug 1, 2021 · 784533b · 784533b · odow · Aug 1, 2021
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diff --git a/NEWS.md b/NEWS.md
@@ -1,6 +1,25 @@
 JuMP release notes
 ==================
 
+Version 0.21.9 (August 1, 2021)
+---------------------------------
+
+For a detailed list of the closed issues and pull requests from this release,
+see the [tag notes](https://github.com/jump-dev/JuMP.jl/releases/tag/v0.21.9).
+A summary of changes are as follows:
+
+- New features:
+  * Containers now support arbitrary container types by passing the type to the
+    `container` keyword and overloading `Containers.container`.
+  * `is_valid` now supports nonlinear constraints
+  * Added `unsafe_backend` for querying the inner-most optimizer of a JuMP
+    model.
+  * Nonlinear parameters now support the plural `@NLparameters` macro.
+  * Containers (e.g., `DenseAxisArray`) can now be used in vector-valued
+    constraints.
+- Documentation, maintenance and performance:
+  * Various improvements to the documentation.
+
 Version 0.21.8 (May 8, 2021)
 ---------------------------------
 

diff --git a/Project.toml b/Project.toml
@@ -1,7 +1,7 @@
 name = "JuMP"
 uuid = "4076af6c-e467-56ae-b986-b466b2749572"
 repo = "https://github.com/jump-dev/JuMP.jl.git"
-version = "0.21.8"
+version = "0.21.9"
 
 [deps]
 Calculus = "49dc2e85-a5d0-5ad3-a950-438e2897f1b9"

diff --git a/README.md b/README.md
@@ -7,11 +7,11 @@ JuMP is a domain-specific modeling language for [mathematical optimization](http
 embedded in [Julia](https://julialang.org/). You can find out more about us by
 visiting [jump.dev](https://jump.dev).
 
-**Latest Release**: 0.21.8 (`release-0.21` branch):
+**Latest Release**: 0.21.9 (`release-0.21` branch):
   * Installation via the Julia package manager:
     * `import Pkg; Pkg.add("JuMP")`
   * Get help:
-    * Read the [Documentation](https://jump.dev/JuMP.jl/v0.21.8/)
+    * Read the [Documentation](https://jump.dev/JuMP.jl/v0.21.9/)
     * Ask a question on the [Community forum]
   * Testing status:
     * Github Actions: [![Build Status](https://github.com/jump-dev/JuMP.jl/workflows/CI/badge.svg?branch=release-0.21)](https://github.com/jump-dev/JuMP.jl/actions?query=workflow%3ACI)