Update nikic/php-parser dependency to ^3.1.

Initial commit of the composer.lock.

Author: tomzx

composer.json

@@ -19,21 +19,15 @@
 	"support": {
 		"issues": "https://github.com/tomzx/php-semver-checker/issues"
 	},
-	"repositories": [
-		{
-			"type": "vcs",
-			"url": "https://github.com/tomzx/php-parser"
-		}
-	],
 	"require": {
 		"php": ">=5.5.0",
 
-		"hassankhan/config": "~0.10",
-		"herrera-io/phar-update": "~2.0",
-		"nikic/php-parser": "dev-features/php-semver-checker",
-		"symfony/console": "~2.7|~3.0",
-		"symfony/yaml": "~2.7|~3.0",
-		"tomzx/finder": "~0.1"
+		"hassankhan/config": "^0.10",
+		"herrera-io/phar-update": "^2.0",
+		"nikic/php-parser": "^3.1",
+		"symfony/console": "^2.7|^3.0",
+		"symfony/yaml": "^2.7|^3.0",
+		"tomzx/finder": "^0.1"
 	},
 	"require-dev": {
 		"mockery/mockery": "~0.9",