Remove candletick series labels

[nilshg]

The current recipe produces a separate label for each bar, which completely clutters the plot if a user calls plot(ta; legend = :topleft) (or any other legend position). With this change no labels are produced by default, allowing the user to combine the candlestick plot with other plots and add a legend without having dozens of y1, y2, y3... entries in the legend.

[codecov-commenter]

Codecov Report

Merging #505 (b083203) into master (0356f4b) will decrease coverage by 0.23%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #505      +/-   ##
==========================================
- Coverage   88.13%   87.90%   -0.24%     
==========================================
  Files          12       12              
  Lines         708      711       +3     
==========================================
+ Hits          624      625       +1     
- Misses         84       86       +2     

Impacted Files	Coverage Δ
src/plotrecipes.jl	13.92% <0.00%> (-0.37%)	:arrow_down:
src/timearray.jl	98.26% <0.00%> (+0.01%)	:arrow_up:

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[nilshg]

Bump

[iblislin]

Thanks for your contributions!