added prop options and func timeFormatter (#11256)
added prop options and func timeFormatter (#11256)

added property `options`, which can be found in [the code](https://github.com/joewalnes/smoothie/blob/15fc4b62f5b23c8d5dd1784c820ae73f341626e6/smoothie.js#L270).
Even though it's not mentioned in the docs, it useful to be able to access these options after chart is initialized when you want to change appearance in real tme.

added function `timeFormatter`, which is mentioned in [right here, in the definitions](https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/smoothie/smoothie.d.ts#L127) and can be found in [the code](https://github.com/joewalnes/smoothie/blob/15fc4b62f5b23c8d5dd1784c820ae73f341626e6/smoothie.js#L795)
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