Project readme update - update command count reference

[0x7FFFFFFFFFFFFFFF]

PS C:\> (gcm -module dbatools | Measure-Object).Count
707
PS C:\>

[ClaudioESSilva]

Hi folks, We are still below the 700 mark. We have: 694 (Functions (692) + CmdLet (2)) And: 13 Alias

[niphlod]

has now grown into a collection of [over 700 commands] to has now grown into a collection of [nearly 700 commands] ;-)

[niphlod]

dunno what to do except approve all of the above ... let's not keep PRs around for weeks ;-)

[jpomfret]

I've committed that slight wording tweak and once the checks pass I'll merge it in - this is an easy one :)