pwsh should be in the PATH with beta.9

What if I don't install Beta.9?

But isn't this file only used with PSCore6? Eventually we will only support the final release which will be called pwsh.

By default Windows don't have pwsh.exe installed. Currently we can not build PowerShell Core 6.0 on Windows from VS Code until we install PowerShell Core 6.0 >=Beta.9 but can from command line. On Unix we have to install PowerShell Core 6.0 in any case because we deprecate install.sh.
So question is - Shall we continue support build PowerShell Core with Windows PowerShell or no? If we continue build from command line why we don't support to build from VS Code?

@iSazonov I see. I wasn't thinking about the initial bootstrap issue, however, it would seem like this is an edge case as we're getting closer to a final version of 6.0.0. I expect the significant majority of people building PSCore6 to be using the build.psm1 module. The only time I ever build PSCore6 from VSCode is when debugging something.

We should document if PowerShell Core 6.0 is mandatory prerequest on Windows now or better add in BootStrap (check latest version?).

I like the suggestion to have it in Start-PSBootStrap. Created issue #5367

I'll submit a doc update: #5368

Ok, I close the PR because we'll have pwsh.exe with Start-PSBootStrap.