test on macos 11 (#45)

* test on macos 11

* gpl remark in readme, trigger test on Macosx 11

.github/workflows/ci.yml

@@ -21,6 +21,7 @@ jobs:
         os:
           - ubuntu-latest
           - windows-latest
+          - macOS-11 # intel
           - macOS-13 # intel
           - macOS-14 # arm
         arch:
@@ -31,7 +32,9 @@ jobs:
             arch: aarch64
           - os: windows-latest
             arch: aarch64
-          - os: macOS-13 
+          - os: macOS-11
+            arch: aarch64
+          - os: macOS-13
             arch: aarch64
           - os: macOS-14
             version: 1.6

README.md

@@ -11,12 +11,15 @@ Used by [VoronoiFVM](https://github.com/j-fu/VoronoiFVM.jl) and  [GradientRobust
 a package for novel, gradient robust finite element methods.
 
 ## Additional functionality:
-## Companion packages:
 
 
 - Tools to create tensor product grids
 - Tools for grid modification
-- [Gmsh.jl](https://github.com/JuliaFEM/Gmsh.jl) extension
+
+## Companion packages:
+- [Gmsh.jl](https://github.com/JuliaFEM/Gmsh.jl) extension. Please be aware about the fact that, while this package
+  and  [Gmsh.jl](https://github.com/JuliaFEM/Gmsh.jl) are MIT licensed, the underlying binary code of Gmsh is
+  distributed under the [GPLv2 license](https://gmsh.info/LICENSE.txt).
 - Visualization of these grids and of functions on them is avaialable in [GridVisualize.jl](https://github.com/j-fu/GridVisualize.jl).
 - [SimplexGridFactory](https://github.com/j-fu/SimplexGridFactory.jl) contains an API which allows to
   create `ExtendableGrid` objects with  [Triangulate.jl](https://github.com/JuliaGeometry/Triangulate.jl) which wraps the Triangle mesh generator