v1.5.0 to fix multiple-definitions linker error

#### Releases v1.5.0

1. Fix multiple-definitions linker error.
2. Add example [multiFileProject](examples/multiFileProject) to demo for multiple-file project to avoid `multiple-definitions` linker error

Author: khoih-prog

library.json

@@ -22,8 +22,7 @@
       "tests"
     ]
   },
-  "dependencies":
-  [],
+  "license": "GPL-3.0",
   "frameworks": "*",
   "platforms": "espressif32",
   "examples": "examples/*/*/*.ino",