Composer Changes

- Changed PHP version to 7.3
- Changed CodeIgniter to 4.1.3

composer.json

@@ -17,8 +17,8 @@
 	],
 	"homepage": "https://github.com/opensourcepos/opensourcepos",
 	"require": {
-		"php": "^7.2",
+		"php": "^7.3",
-		"codeigniter/framework": "^3.1.11",
+		"codeigniter/framework": "^4.1.3",
 		"dompdf/dompdf": "^0.8.5",
 		"tamtamchik/namecase": "^1.0",
 		"paragonie/random_compat": "^2.0",