Dependency-Update due to a new Google announcement

[ghost]

On 19 December Google announced the following:

In the second half of 2018, Play will require that new apps and app updates target a recent Android API level. This will be required for new apps in August 2018, and for updates to existing apps in November 2018. This is to ensure apps are built on the latest APIs optimized for security and performance.

source: https://android-developers.googleblog.com/2017/12/improving-app-security-and-performance.html

More specifically:

August 2018: New apps required to target API level 26 (Android 8.0) or higher.
November 2018: Updates to existing apps required to target API level 26 or higher.
2019 onwards: Each year the targetSdkVersion requirement will advance. Within one year following each Android dessert release, new apps and app updates will need to target the corresponding API level or higher.

Just replace the dependency 'com.android.support:appcompat-v7:25.2.0' with 'com.android.support:appcompat-v7:27.1.1'.

Would be great if this library is going to be up-to-date as well. Thanks!