Bump tiles-maven-plugin from 2.17 to 2.18 (#12)

* Bump tiles-maven-plugin from 2.17 to 2.18

Bumps [tiles-maven-plugin](https://github.com/repaint-io/maven-tiles) from 2.17 to 2.18.
- [Release notes](https://github.com/repaint-io/maven-tiles/releases)
- [Changelog](https://github.com/repaint-io/maven-tiles/blob/master/CHANGELOG.adoc)
- [Commits](https://github.com/repaint-io/maven-tiles/compare/tiles-maven-plugin-2.17...tiles-maven-plugin-2.18)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Test build with JDK 15

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Paul Campbell <pcampbell@kemitix.net>

.github/workflows/build-maven.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ 8, 11, 14 ]
+        java: [ 8, 11, 15 ]
     steps:
       - uses: kamiazya/setup-graphviz@v1
       - uses: actions/checkout@v2

pom.xml

@@ -15,7 +15,7 @@
     <version>DEV-SNAPSHOT</version>
 
     <properties>
-        <tiles-maven-plugin.version>2.17</tiles-maven-plugin.version>
+        <tiles-maven-plugin.version>2.18</tiles-maven-plugin.version>
         <kemitix-maven-tiles.version>2.5.0</kemitix-maven-tiles.version>
         <kemitix-checkstyle-ruleset.version>5.4.0</kemitix-checkstyle-ruleset.version>