Update shell-integration.md for powershell-5

[wadabum]

PS C:\Users> $PSVersionTable.PSVersion

Major  Minor  Build  Revision
-----  -----  -----  --------
5      1      19041  5848

PS C:\Users> echo "`e]133;D`a"
e]133;D   # this dings too!!
PS C:\Users> echo "$([char]0x1b)]133;D`a"
# no output, no ding (as it should)
PS C:\Users> echo "$([char]0x1b)]133;D$([char]07)"
# no output, no ding (as it should)
PS C:\Users> echo "$([char]07)"
# dings as expected

Maybe one could argue to make it

$esc = [char]0x1b
$bel = [char]0x07
$out += "${esc}]133;D;$gle${bel}" ...

but i got no idea how slow/fast the individual invokes might be ;)

[learn-build-service-prod]

Learn Build status updates of commit c0901c2:

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