print a newline in print_timer

[KristofferC]

Fixes #56

[codecov-commenter]

Codecov Report

Merging #88 into master will increase coverage by 0.61%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   91.64%   92.26%   +0.61%     
==========================================
  Files           4        4              
  Lines         323      323              
==========================================
+ Hits          296      298       +2     
+ Misses         27       25       -2     

Impacted Files	Coverage Δ
src/show.jl	95.14% <75.00%> (+1.94%)	⬆️

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