Fix deprecation warning on v0.6, clean up trailing spaces

[ScottPJones]

No description provided.

[coveralls]

Coverage remained the same at 97.94% when pulling 854995cd7ea0b86d60e0f9399195ef69aafd86d5 on spj/fix06 into 372ad6b on newmaster.

[codecov-io]

Codecov Report

Merging #4 into newmaster will increase coverage by 0.75%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##           newmaster       #4      +/-   ##
=============================================
+ Coverage      97.94%   98.69%   +0.75%     
=============================================
  Files              6        6              
  Lines            534      535       +1     
=============================================
+ Hits             523      528       +5     
+ Misses            11        7       -4

Impacted Files	Coverage Δ
src/formatexpr.jl	100% <ø> (ø)	⬆️
src/cformat.jl	98.02% <ø> (+0.65%)	⬆️
src/fmtcore.jl	99.33% <100%> (+1.98%)	⬆️
src/fmt.jl	98.46% <0%> (+0.02%)	⬆️

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[coveralls]

Coverage remained the same at 97.94% when pulling ecc6c3f on spj/fix06 into 372ad6b on newmaster.