REFACTOR Silverstripe 5 compatibility (#12)

Author: jsirish

composer.json

@@ -1,25 +1,33 @@
 {
     "name": "dynamic/silverstripe-elemental-embedded-code",
     "description": "Embed code like iFrames or Javascript on a page.",
+    "license": "BSD-3-Clause",
+    "type": "silverstripe-vendormodule",
+    "keywords": [
+        "silverstripe",
+        "elemental",
+        "content",
+        "blocks",
+        "embedded",
+        "iframe",
+        "javascript"
+    ],
     "authors": [
         {
             "name": "Dynamic",
             "email": "dev@dynamicagency.com",
             "homepage": "https://www.dynamicagency.com"
         }
     ],
-    "keywords": [
-        "silverstripe", "elemental", "content", "blocks", "embedded", "iframe", "javascript"
-    ],
-    "type": "silverstripe-vendormodule",
-    "license": "BSD-3-Clause",
     "require": {
-        "dnadesign/silverstripe-elemental": "^4.8"
+        "dnadesign/silverstripe-elemental": "^5",
+        "silverstripe/framework": "^5"
     },
     "require-dev": {
-        "silverstripe/recipe-testing": "^2",
-        "squizlabs/php_codesniffer": "^3.0"
+        "silverstripe/recipe-testing": "^3"
     },
+    "minimum-stability": "dev",
+    "prefer-stable": true,
     "autoload": {
         "psr-4": {
             "Dynamic\\Elements\\Embedded\\": "src/",
@@ -29,11 +37,9 @@
     "config": {
         "process-timeout": 600
     },
-    "minimum-stability": "dev",
-    "prefer-stable": true,
     "extra": {
         "branch-alias": {
-            "dev-master": "2.x-dev"
+            "dev-master": "3.x-dev"
         }
     },
     "scripts": {