Change to numerically sortable name for non-google-play android apk.
diff --git a/Makefile b/Makefile
index f178bc6..2c0b4e9 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@
 
 tarball: release
 	cp app/build/outputs/apk/release/app-universal-release.apk \
-		mupdf-android-viewer-$(shell git describe --tags).apk
+		mupdf-$(shell git describe --tags)-android-viewer.apk
 
 clean:
 	rm -rf .gradle build