fix library url

Author: Forairaaaaa

library.json

@@ -7,7 +7,7 @@
     },
     "repository": {
         "type": "git",
-        "url": "https://github.com/M5Stack/M5StackChan.git"
+        "url": "https://github.com/m5stack/StackChan-BSP"
     },
     "dependencies": {
         "M5Unified": "*",
@@ -18,4 +18,4 @@
     "version": "1.0.0",
     "frameworks": "arduino",
     "platforms": "espressif32"
-}
+}