78 typesafegetter (#80)

* Improve type safety and immutability

* Reorder functions

* Test immutability

* Improve type safety

* Updgrade deps

Author: Greg Bowler

README.md

@@ -79,7 +79,7 @@ echo $config->get("database.password");		// super-secret-passw0rd
 
 ## Example usage - generating configuration files:
 
-Sometimes is it useful to generate config files on-the-fly, such as from Continuous Integration scripts. Below shows a quick example of how to generate a `config.deploy.ini` file with a few key-values that will override the default.
+Sometimes it's useful to generate config files on-the-fly, such as from Continuous Integration scripts. Below shows a quick example of how to generate a `config.deploy.ini` file with a few key-values that will override the default.
 
 ```
 vendor/bin/config-generate deploy "shopapi.key=test-api-key" "database.schema=local_shop_$BRANCH_NAME"

composer.json

@@ -26,6 +26,13 @@
 		}
 	],
 
+	"funding": [
+		{
+			"type": "github",
+			"url": "https://github.com/sponsors/PhpGt"
+		}
+	],
+
 	"autoload": {
 		"psr-4": {
 			"Gt\\Config\\": "./src"