Update Platformio Adapter

[varashellov]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Does this change affect user-facing APIs or examples documented on http://prebid.org?
• Other

Description of change

Added to request:

imp.secure, 
app.id, app.name, app.bundle, app.storeurl, app.domain,
device.dnt, device.geo, device.ifa

• test parameters for validating bids

{
    bidder: 'platformio',
    params: {
        pubId: '29521',
        siteId: '26049',
        size: '300X250',
        placementId: '123',
        bidfloor: '0.001',
        ifa: 'IFA',
        latitude: '40.712775',
        longitude: '-74.005973'
    }
}

Be sure to test the integration with your adserver using the Hello World sample page.

• contact email of the adapter’s maintainer
  siarhei.kasukhin@platform.io
• official adapter submission

For any changes that affect user-facing APIs or example code documented on http://prebid.org, please provide:

• A link to a PR on the docs repo at https://github.com/prebid/prebid.github.io/

Other information

[jsnellbaker]

Hi @varashellov, the changes to the files look good to me. If you are going to support additional fields in your params, can you please update the platformioBidAdapter.md file in this repo and your bidders page in the docs repo? Thanks.

[varashellov]

Hi @jsnellbaker, thanks for the quick response.
Pull request prebid/prebid.github.io#743

[jsnellbaker]

LGTM