number of parameters at ArgumentCountError is always 2 in exception

[tkuschel]

The exception ArgumentCountError gives wrong given parameter length.
When a function is called with wrong amounts of parameters, e.g. static BCMath::scale(4,2,3), in the magic static function __callStatic($name, $arguments) line 373 throws an error. That is ok, but the func_num_args() used - only returns the number of parameters of the called function and is always 2 in that case. That should be the amount of $arguments (array).
You are probably wondering why I came up with this? My editor shows me an error that the parameters for the __callStatic() magic function should always be the amount of 2.
I fixed it with PR #6

[terrafrost]

Fixed with #6

Thanks!