Pixel Wheels: remove 0.18.0-alpha (18)

Skip pre-release versions.

metadata/com.agateau.tinywheels.android.yml

@@ -174,30 +174,9 @@ Builds:
       - make -C .. assets
       - make -C .. packer
 
-  - versionName: 0.18.0-alpha
-    versionCode: 18
-    commit: 0.18.0-alpha
-    subdir: android
-    sudo:
-      - apt-get update || apt-get update
-      - apt-get install -y python3-pip python3-setuptools imagemagick-6.q16
-    gradle:
-      - yes
-    rm:
-      - tools/packr.jar
-    prebuild:
-      - sed -i -e 's#./gradlew#gradle#' ../Makefile
-      - git cherry-pick --no-commit 4a56032cc4e823ba8d3fd35d5b1941951537b208
-    scandelete:
-      - android/libs/
-    build:
-      - pip3 install --user -r ../requirements.txt
-      - gradle tools:dist -b ../build.gradle
-      - make -C .. assets
-      - make -C .. packer
-
 AutoUpdateMode: Version %v
 UpdateCheckMode: HTTP
+UpdateCheckIgnore: (alpha|beta|rc)
 UpdateCheckData: https://raw.githubusercontent.com/agateau/pixelwheels/master/version.properties|VERSION_CODE=(.*)|.|VERSION=(.*)
-CurrentVersion: 0.18.0-alpha
-CurrentVersionCode: 18
+CurrentVersion: 0.17.0
+CurrentVersionCode: 17