Improve UploadFromUrl::extendOptions() and fix PSR-2 codestlye

[bboure]

Changed

• Used path_info() instead of explode() to parse filename and extensions.

Added

• wildcard for mime types. e.g.: image/* will match image/png

Fixed

• the codestyle to be PSR-2 compliant.
• too big/small error messages

[codecov-io]

Codecov Report

Merging #7 into master will increase coverage by 0.69%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   82.97%   83.67%   +0.69%     
==========================================
  Files           2        2              
  Lines          47       49       +2     
==========================================
+ Hits           39       41       +2     
  Misses          8        8

Impacted Files	Coverage Δ
tests/models/Model.php	0% <ø> (ø)	⬆️
src/UploadFromUrl.php	91.11% <94.73%> (+0.41%)	⬆️

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[igogo5yo]

@bboure thank you for this contribution!