clean up whitespaces

[jishnub]

• replaces non-breaking spaces with regular ones
• remove trailing white spaces
• add newlines at end of files

Only white spaces are changed in this PR, no code is affected

[codecov]

Codecov Report

Merging #180 (054a1b4) into master (8a82d79) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #180   +/-   ##
=======================================
  Coverage   78.79%   78.79%           
=======================================
  Files          13       13           
  Lines        2108     2108           
=======================================
  Hits         1661     1661           
  Misses        447      447           

Impacted Files	Coverage Δ
src/PaduaTransform.jl	92.00% <100.00%> (ø)
src/chebyshevtransform.jl	96.76% <100.00%> (ø)

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