[BUG] meshio does deal with wedge/prism element type for medit .mesh file format

[JulienCHAPELAT]

Describe the bug

It is not possible the write a mesh with wedge/prism in the medit .mesh file format.

To Reproduce

with the .msh file (see below)

import meshio
mesh = meshio.read("wedge.msh")
meshio.write("wedge.mesh", mesh)

Diagnose

As with gmsh API, it seems not possible to export wedge/prism in the medit .mesh file format.

File to reproduce

I can not upload a .msh or .mesh file here, so here is the right content:

For the .msh

$MeshFormat
4.1 0 8
$EndMeshFormat
$Entities
0 0 0 2
1 0 0 0 0 0 0 0 0 
2 0 0 0 1 1 1 0 0 
$EndEntities
$Nodes
2 6 1 6
3 1 0 6
1
2
3
4
5
6
0 0 0
1 0 0
0 1 0
0 0 1
1 0 1
0 1 1
3 2 0 0
$EndNodes
$Elements
1 1 1 1
3 2 6 1
1 1 2 3 4 5 6 
$EndElements

For the resulting .mesh

MeshVersionFormatted 2

Dimension 3

Vertices
6
0.0 0.0 0.0 1
1.0 0.0 0.0 1
0.5 1.0 0.0 1
0.0 0.0 1.0 1
1.0 0.0 1.0 1
0.5 1.0 1.0 1

Prisms
1
1 2 3 4 5 6 100

End