fix #48

[shabbybanks]

Allow user to pass a scalar quantile in, without it being interpreted as the number of divisions.

[codecov-io]

Codecov Report

Merging #49 into master will increase coverage by 1.41%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   55.62%   57.04%   +1.41%     
==========================================
  Files          13       13              
  Lines         320      284      -36     
==========================================
- Hits          178      162      -16     
+ Misses        142      122      -20

Impacted Files	Coverage Δ
R/stats.R	100% <ø> (ø)	:arrow_up:
R/scale-cyclical.R	85.71% <0%> (-0.78%)	:arrow_down:
R/theme.R	100% <0%> (ø)	:arrow_up:
R/scale-.R	0% <0%> (ø)	:arrow_up:
R/utils.R	100% <0%> (ø)	:arrow_up:
R/geom-density-line.R	0% <0%> (ø)	:arrow_up:
R/position.R	0% <0%> (ø)	:arrow_up:
R/geomsv.R	0% <0%> (ø)	:arrow_up:
R/geoms.R	34.37% <0%> (+0.22%)	:arrow_up:
... and 1 more

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[clauswilke]

I think this is fine, but could you please provide a few use cases demonstrating your new use as well as the old one where we set quantile equal to an integer value?

[clauswilke]

Thanks!