Fix some ES6 syntax issue and add support for getting axis keys from options #85
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xAxis and yAxis keys are currently hard-coded as either 'x', or 't' and 'y'.
This change adds support to use the provided xAxisKey and yAxisKey values from the chartjs options object that is provided by the user.
Fall back to the original behavior in case these are not provided.
This is a non-breaking change.
Also, add the 'const' keyword in front of the addFilter method.