correct php-parser version

Author: gossi

composer.json

@@ -32,7 +32,7 @@
 		"symfony/options-resolver" : "^3|^4",
 		"phootwork/file" : "~0",
 		"phootwork/tokenizer" : "~0",
-		"nikic/php-parser" : "^4|^3|^2|^1"
+		"nikic/php-parser" : "~3|^4"
 	},
 	"require-dev" : {
 		"phpunit/phpunit" : "^5.7",