Prep for v1.3.1 (#3093)

Project.toml

@@ -1,7 +1,7 @@
 name = "JuMP"
 uuid = "4076af6c-e467-56ae-b986-b466b2749572"
 repo = "https://github.com/jump-dev/JuMP.jl.git"
-version = "1.3.0"
+version = "1.3.1"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

README.md

@@ -10,7 +10,7 @@ embedded in [Julia](https://julialang.org/). You can find out more about us by
 visiting [jump.dev](https://jump.dev).
 
 
-**Latest Release**: [![version](https://juliahub.com/docs/JuMP/DmXqY/1.3.0/version.svg)](https://juliahub.com/ui/Packages/JuMP/DmXqY/1.3.0) (`release-1.0` branch):
+**Latest Release**: [![version](https://juliahub.com/docs/JuMP/DmXqY/1.3.1/version.svg)](https://juliahub.com/ui/Packages/JuMP/DmXqY/1.3.1) (`release-1.0` branch):
  * Installation via the Julia package manager:
  * `import Pkg; Pkg.add("JuMP")`
  * Get help:

docs/src/release_notes.md

@@ -1,5 +1,21 @@
 # Release notes
 
+## Version 1.3.1 (September 28, 2022)
+
+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/v1.3.1).
+
+- Bug fixes:
+ - Fixed a performance issue in `relax_integrality`
+ - Fixed the type stability of operators with `Complex` arguments
+ - Fixed a bug which added additional `+()` terms to some nonlinear expressions
+ - Fixed potential method ambiguities with `AffExpr` and `QuadExpr` objects
+- Documentation and maintenance:
+ - Added vale as a linter for the documentation
+ - Added a tutorial on debugging JuMP models
+ - Fixed a number of typos in the documentation
+ - Many other small tweaks to the documentation
+
 ## Version 1.3.0 (September 5, 2022)
 
 For a detailed list of the closed issues and pull requests from this release,