New DEBUGME_SHOW_TIMESTAMP environment variable

[krlmlr]

to hide timestamp output for reproducibility.

[codecov-io]

Codecov Report

Merging #49 (12ab761) into master (136c159) will decrease coverage by 0.49%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
- Coverage   97.87%   97.38%   -0.50%     
==========================================
  Files           6        6              
  Lines         188      191       +3     
==========================================
+ Hits          184      186       +2     
- Misses          4        5       +1     

Impacted Files	Coverage Δ
R/debug.R	95.83% <75.00%> (-1.27%)	⬇️

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[gaborcsardi]

Thanks!