v0.5.0

configure strategy + range duration with options.

The time duration for range queries can also be configured. This allows for more fine grained control over the number of data points on which the strategies is to be applied.

For backwards compatibility the earlier WithStrategy(...) function can still be used. However, note that this results in the default setting of range duration (as exposed by the strategy) being used. If the time duration needs to be configured, then WithStrategyOptions(...) should now be used.