Bump com.google.android.gms:play-services-maps from 17.0.0 to 18.1.0

[dependabot[bot]]

Bumps com.google.android.gms:play-services-maps from 17.0.0 to 18.1.0.

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[ligi]

This would need minSDK 19

[dependabot[bot]]

A newer version of com.google.android.gms:play-services-maps exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.