chore(#37): bump version to 1.1.1+18

Patch increment for the #37 compact-tile feature (the bump that was owed
inside PR #47). Build +18 stays ahead of rc.3 (+17) so a 1.1.1 build
installs over the sideloaded RC.

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.1.0+15
+version: 1.1.1+18
 
 environment:
   sdk: ^3.9.2