Updates for ggplot2 version 3.4.0 deprecation of size in favor of linewidth

[billdenney]

ggplot2 version 3.4.0 deprecated the use of size for line width in favor of linewidth. This changes all size arguments for lines to linewidth.

It also removes whitespace at the end of lines.

[codecov-commenter]

Codecov Report

Merging #39 (09bf819) into master (579f5b4) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master      #39   +/-   ##
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  Coverage   81.06%   81.06%           
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  Files           4        4           
  Lines        1051     1051           
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  Hits          852      852           
  Misses        199      199           

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