Revert "Change FPDF package" (#6)

This reverts commit 38f145c.

Author: Shawn Tunney

composer.json

@@ -21,7 +21,7 @@
     "require": {
         "php": ">=5.5.9",
         "illuminate/support": ">=5.0",
-        "setasign/fpdi-fpdf": "^1.6"
+        "itbz/fpdi": "^1.6"
     },
     "require-dev": {
         "phpunit/phpunit": "4.*",