Readme: update compiler information and build instructions

7 jobs for v3-dev-ovmb1 in 11 minutes and 52 seconds (queued for 6 seconds)
latest
Status Name Job ID Coverage
  Test
passed clang-c++17 #140940
Linux

00:11:52

passed cppcheck #140942
Linux

00:01:28

passed doc #140945
Linux

00:00:07

passed gcc-c++17 #140939
Linux

00:08:47

failed macos-c++17 #140941
Apple

00:00:09

failed VS2019-32-bit #140943
VS2019

00:01:42

failed VS2019-64-bit #140944
VS2019

00:04:46

 
Name Stage Failure
failed
macos-c++17 Test
In file included from /Users/jenkins/builds/b72f60fc/0/OpenVolumeMesh/OpenVolumeMesh/src/OpenVolumeMesh/Core/TopologyKernel.hh:45:
/Users/jenkins/builds/b72f60fc/0/OpenVolumeMesh/OpenVolumeMesh/src/OpenVolumeMesh/Core/ResourceManager.hh:45:10: fatal error: 'optional' file not found
#include <optional>
^~~~~~~~~~
1 error generated.
make[2]: *** [src/CMakeFiles/OpenVolumeMesh.dir/OpenVolumeMesh/Attribs/InterfaceAttrib.cc.o] Error 1
make[1]: *** [src/CMakeFiles/OpenVolumeMesh.dir/all] Error 2
make: *** [all] Error 2
Cleaning up file based variables
ERROR: Job failed: exit status 1
failed
VS2019-32-bit Test
E:\gitlab\builds\cu6mRa6g\0\OpenVolumeMesh\OpenVolumeMesh\build-debug>cd .. 

E:\gitlab\builds\cu6mRa6g\0\OpenVolumeMesh\OpenVolumeMesh>cd src\Unittests\TestFiles

E:\gitlab\builds\cu6mRa6g\0\OpenVolumeMesh\OpenVolumeMesh\src\Unittests\TestFiles>..\..\..\build-debug\Unittests\Debug\unittests.exe

E:\gitlab\builds\cu6mRa6g\0\OpenVolumeMesh\OpenVolumeMesh\src\Unittests\TestFiles>IF -1073741515 NEQ 0 exit /b -1073741515
Cleaning up file based variables
ERROR: Job failed: exit status 1
failed
VS2019-64-bit Test
E:\gitlab\builds\mJQzyNSJ\0\OpenVolumeMesh\OpenVolumeMesh\build-debug>cd .. 

E:\gitlab\builds\mJQzyNSJ\0\OpenVolumeMesh\OpenVolumeMesh>cd src\Unittests\TestFiles

E:\gitlab\builds\mJQzyNSJ\0\OpenVolumeMesh\OpenVolumeMesh\src\Unittests\TestFiles>..\..\..\build-debug\Unittests\Debug\unittests.exe

E:\gitlab\builds\mJQzyNSJ\0\OpenVolumeMesh\OpenVolumeMesh\src\Unittests\TestFiles>IF -1073741515 NEQ 0 exit /b -1073741515
Cleaning up file based variables
ERROR: Job failed: exit status 1