Added Fpdf output

[MaximilianKresse]

See #48

[codecov-commenter]

Codecov Report

Merging #49 into master will decrease coverage by 3.87%. The diff coverage is 0.00%.

@@              Coverage Diff              @@
##              master      #49      +/-   ##
=============================================
- Coverage     100.00%   96.12%   -3.88%     
- Complexity       312      325      +13     
=============================================
  Files             16       17       +1     
  Lines            720      749      +29     
=============================================
  Hits             720      720              
- Misses             0       29      +29     

Impacted Files	Coverage Δ	Complexity Δ
src/Output/QRFpdf.php	0.00% <0.00%> (ø)	13.00 <13.00> (?)
src/QRCode.php	100.00% <ø> (ø)	29.00 <0.00> (ø)

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[codemasher]

Hey! Thank you so much for your contribution! It looks good so far, only a few minor things (code style, declare, file docblock) i'd fix after merge if that's ok for you.

[MaximilianKresse]

Sure :-)