Library name conflict on PlatformIO

On file `library.properties`
* `name=PCM`

This name is already being used by another library: https://github.com/TMRh20/TMRpcm

When I installed dependency "PCM" on the `platformio.ini` of my project it installed the one above, causing compilation errors with your example code.

My workaround was to specify your library via id: 

```
lib_deps = 
        1608
```