composer: add branch alias

composer.json

@@ -1,14 +1,17 @@
 {
     "name": "rector/rector",
     "description": "Instant upgrade and refactoring of your PHP code",
+    "bin": [
+        "bin/rector"
+    ],
+    "license": "MIT",
+    "homepage": "https://getrector.org",
     "keywords": [
         "instant upgrades",
         "instant refactoring",
         "ast",
         "automated refactoring"
     ],
-    "homepage": "https://getrector.org",
-    "license": "MIT",
     "authors": [
         {
             "name": "Tomas Votruba",
@@ -21,9 +24,6 @@
             "homepage": "https://janmikes.cz"
         }
     ],
-    "bin": [
-        "bin/rector"
-    ],
     "require": {
         "php": "^7.3|^8.0",
         "ext-dom": "*",
@@ -146,6 +146,11 @@
         ],
         "rector": "bin/rector process --ansi"
     },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "0.10-dev"
+        }
+    },
     "config": {
         "platform-check": false,
         "sort-packages": true