Development

- Added dependency injection support.
- Added php-di composer dependency.
- Added `ClassLoader` class.
- Added `IClassLoader` interface.
- Added unit-tests for dependency injection.
- Updated documentation to reflect new features.

composer.json

@@ -27,7 +27,8 @@
     }
   ],
   "require": {
-    "php": ">=7.1"
+    "php": ">=7.1",
+    "php-di/php-di": "^6.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^6.0",
@@ -38,4 +39,4 @@
       "Pecee\\": "src/Pecee/"
     }
   }
-}
+}