Update RELEASE-NOTES for Stats Subscribers

[staskus]

Updating release notes for Stats Subscribers project
More information: https://github.com/Automattic/wordpress-mobile/issues/47

[staskus]

@aditi-bhatia, @irfano

Feel free to use the testing app version generated by this PR for testing if you prefer not to build the Xcode version.

Also, let me know if you think that release notes should be reformulated.

Thanks!

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr23159-769157c
	Version	24.8
	Bundle ID	org.wordpress.alpha
	Commit	769157c
	App Center Build	WPiOS - One-Offs #9844

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr23159-769157c
	Version	24.8
	Bundle ID	com.jetpack.alpha
	Commit	769157c
	App Center Build	jetpack-installable-builds #8892

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[irfano]

Also, let me know if you think that release notes should be reformulated.

I initially used a shorter description for the RELEASE notes. But yours is good as well. I updated (wordpress-mobile/WordPress-Android@511d590) mine.

[guarani]

Looks good!

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 24.9. This milestone is due in less than 4 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

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