Adding new pattern for new version of Snapchat on iOS

[jaydiablo]

Fixes #1892

Added a new snapchat ios file for 10.33+. According to iTunes store, it still supports iOS 10.0+, so I didn't make any changes there (other than adding iOS 11.4).

Also added some versions to the <10.33 file, and iOS 11.4 to that one as well.

Tests added for coverage.

[codecov]

Codecov Report

Merging #1893 into master will decrease coverage by <.01%.
The diff coverage is 32%.

@@             Coverage Diff              @@
##             master    #1893      +/-   ##
============================================
- Coverage      50.1%   50.09%   -0.01%     
  Complexity      905      905              
============================================
  Files          1667     1668       +1     
  Lines         60890    60913      +23     
  Branches      26989    27001      +12     
============================================
+ Hits          30506    30513       +7     
- Misses        30384    30400      +16

Flag	Coverage Δ	Complexity Δ
#full	45.08% <32%> (-0.01%)	0 <0> (ø)
#lite	2.1% <0%> (-0.01%)	0 <0> (ø)
#standard	26.6% <4%> (-0.02%)	0 <0> (ø)

Impacted Files	Coverage Δ	Complexity Δ
...es/user-agents/apps/snapchat/snapchat-generic.json	0% <0%> (ø)	0 <0> (ø)	⬇️
...-agents/apps/snapchat/snapchat-10-23-to-10-32.json	61.53% <100%> (ø)	0 <0> (?)
...s/user-agents/apps/snapchat/snapchat-10-33-on.json	53.84% <53.84%> (ø)	0 <0> (?)

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