Phpunit tests fails on 64-bit systems

[Powerhead13]

I'm seeing 2 tests fails on Win 10 64 bit.
This definitely happens because of PHP integer overload on 64 bit systems.
This can be fixed by adding quotes to dataprovider values in LuhnTest to convert em to a strings.
Especially, values 561059108101825and 601100099013942

There were 2 failures:

1) Faker\Test\Calculator\LuhnTest::testComputeCheckDigit with data set #9 (561059108101825, '0')
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'0'
+'7'

E:\Projects\faker-fork\test\Faker\Calculator\LuhnTest.php:34

2) Faker\Test\Calculator\LuhnTest::testComputeCheckDigit with data set #10 (601100099013942, '4')
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'4'
+'3'

[Powerhead13]

I created PR to fix that #983

[fzaninotto]

Fixed by #983