Fix php quality errors

[ronanguilloux]

➜  IsoCodes git:(master) make quality                                                                                                                                       

FILE: src/IsoCodes/ISO3166A2.php
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FOUND 5 ERRORS AFFECTING 4 LINES
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  10 | ERROR | [x] PHP keywords must be lowercase; expected "const" but found "CONST"
 270 | ERROR | [x] Expected 1 space(s) after IF keyword; 0 found
 270 | ERROR | [x] Expected 1 space(s) after closing parenthesis; found 0
 273 | ERROR | [x] Expected 0 spaces before closing parenthesis; 1 found
 275 | ERROR | [x] Expected 1 newline at end of file; 0 found
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PHPCBF CAN FIX THE 5 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Time: 353ms; Memory: 8MB

make: *** [sniff] Error 2