fix(PathElement): fixed build issue with swift 4.2

[AppPear]

fix(PathElement): fixed build issue with swift 4.2 as now @noescape is default, added @escape to PathApplier

[codecov[bot]]

Codecov Report

Merging #6 into master will decrease coverage by 0.77%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
- Coverage   94.21%   93.43%   -0.78%     
==========================================
  Files           2        2              
  Lines         380      335      -45     
  Branches        1        0       -1     
==========================================
- Hits          358      313      -45     
  Misses         22       22

Impacted Files	Coverage Δ
Source/PathElement.swift	100% <100%> (ø)	:arrow_up:
Source/BezierPath+Length.swift	92.76% <0%> (-0.83%)	:arrow_down:

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