Update composer.json

Signed-off-by: Richard McDaniel <richard.lee.mcdaniel@gmail.com>

Author: rmcdaniel

composer.json

@@ -2,7 +2,7 @@
     "name": "serverlessworkflow/sdk",
     "description": "Provides the PHP API/SPI for the Serverless Workflow Specification.",
     "type": "library",
-    "license": "MIT",
+    "license": "Apache-2.0",
     "autoload": {
         "psr-4": {
             "Serverless\\Workflow\\": "src/"