Can't build project locally due to Promise.finally with es2017

[jadejr]

Describe the bug
When checking out the project locally and running npm run build it fails with:

rc/timeout.ts:8:6 - error TS2550: Property 'finally' does not exist on type 'Promise<unknown>'. Do you need to change your target library? Try changing the 'lib' compiler option to 'es2018' or later.

To Reproduce
Steps to reproduce the behavior:

1. run npm run build

Expected behavior
The build to succeed

Plugin version:

• @capacitor-community/bluetooth-le as of 273e4c1

[jadejr]

I didn't send a small PR to fix it, since it seems es2017 is commonly used for capacitor projects