Fix directive name parsing during minification

[atifaziz]

Fix for issue #3.

[codecov]

Codecov Report

Merging #4 into master will decrease coverage by 1.3%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
- Coverage   98.18%   96.88%   -1.31%     
==========================================
  Files          11       11              
  Lines        1543     1027     -516     
==========================================
- Hits         1515      995     -520     
- Misses         28       32       +4

Impacted Files	Coverage Δ
src/CSharpMinifier/Minifier.cs	100% <100%> (ø)	⬆️
src/CSharpMinifier/CSharpString.cs	91.75% <0%> (-3.76%)	⬇️
src/CSharpMinifier/Position.cs	82.35% <0%> (-0.99%)	⬇️
src/CSharpMinifier/JsonString.cs	96.42% <0%> (-0.55%)	⬇️
src/CSharpMinifier/Scanner.cs	99.76% <0%> (-0.09%)	⬇️
src/CSharpMinifier/SubstringPool.cs	100% <0%> (ø)	⬆️

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