Show maximum two decimal digits

[kiewic]

As suggested by email, the number of decimal places of values in labels should be configurable or limited to two decimal places.

Here is an example of the issue:

Here is how to format values:

https://github.com/Microsoft/powerbi-visuals-utils-formattingutils/blob/master/docs/api/value-formatter.md

[kiewic]

Pull request #10