Represent TimeSeries as an interface

[andviro]

Hi there!

I've converted TimeSeries from struct to interface, more alike to ta4j. I think it's beneficial because TS can be implemented differently, using Influxdb for example.

[codecov[bot]]

Codecov Report

Merging #14 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #14   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          28     28           
  Lines         553    560    +7     
=====================================
+ Hits          553    560    +7

Impacted Files	Coverage Δ
indicator_relative_vigor_index.go	100% <100%> (ø)	:arrow_up:
indicator_basic.go	100% <100%> (ø)	:arrow_up:
testutils.go	100% <100%> (ø)	:arrow_up:
timeseries.go	100% <100%> (ø)	:arrow_up:
rule_stop.go	100% <100%> (ø)	:arrow_up:
analysis.go	100% <100%> (ø)	:arrow_up:
indicator_cci.go	100% <100%> (ø)	:arrow_up:

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[utx0]

Any reason @sdcoffey why you havent merged this one? Looks good to me.

[sdcoffey]

Hey guys, sorry for the delay here, for some reason there's an issue with my github settings that causes me to not get notifications about new PRs on this repo.