Remove infinite numbers support & upgrate to PHP 7.0

Author: Andreu Correa Casablanca

.gitignore

@@ -1,3 +1,4 @@
-composer.lock
-vendor
-coverage_report
+vendor/
+coverage_report/
+.idea/
+composer.lock

composer.json

@@ -15,15 +15,14 @@
 		"source": "http://github.com/Litipk/php-bignumbers"
 	},
 	"require": {
-		"php": ">=5.4.0",
-		"ext-bcmath": "*",
-		"litipk/php-exceptions": ">=0.1.3"
+		"php": ">=7.0",
+		"ext-bcmath": "*"
 	},
 	"require-dev": {
-		"psy/psysh": ">=0.5.2",
-		"phpunit/phpunit": "~4.8",
-		"squizlabs/php_codesniffer": "2.3.*",
-		"codeclimate/php-test-reporter": "dev-master"
+		"psy/psysh": "^0.8",
+		"phpunit/phpunit": "~6.0",
+		"squizlabs/php_codesniffer": "^2.8",
+		"codeclimate/php-test-reporter": "^0.4"
 	},
 	"minimum-stability": "stable",
 	"autoload": {