Changing amplitude example to output values in dB

[OmarAli3]

No description provided.

[per1234]

Fixes #16

[MisterAwesome23]

I feel it can be improved minutely.

No need to use abs(), two reasons, technically sound can be negative decibels also, the amplitudeAnalyzer.read() should ideally return a non negative value so no need of abs()

[OmarAli3]

Hi @MisterAwesome23, thanks for your comment.

• Regarding first reason, taking abs() inside log() will not prevent negative values so decibels still can be negative.
• Regarding second reason, I am not very sure but in practice amplitude can be negative so took into consideration.

[aentinger]

LGTM 👍 Thank you @OmarAli3 🚀