Little cleanup of filterAbout task

app/build.gradle

@@ -189,21 +189,14 @@ if (project.hasProperty("antennaPodServiceAccountEmail")) {
     }
 }
 
-// about.html is templatized so that we can automatically insert
-// our version string in to it at build time.
-task filterAbout {
-    inputs.files files(["src/main/templates/about.html",
-                        "src/main/AndroidManifest.xml"])
-    outputs.file "src/main/assets/about.html"
+task filterAbout(type: Copy) {
+    from "src/main/templates/about.html"
+    into "src/main/assets"
+    filter(ReplaceTokens, tokens: [
+            versionname: android.defaultConfig.versionName,
+            commit     : "git rev-parse --short HEAD".execute().text,
+            year       : new Date().format('yyyy')])
     outputs.upToDateWhen { false }
-} doLast {
-    copy {
-        from "src/main/templates/about.html"
-        into "src/main/assets"
-        filter(ReplaceTokens, tokens: [versionname: android.defaultConfig.versionName,
-                                       commit     : "git rev-parse --short HEAD".execute().text,
-                                       year       : new Date().format('yyyy')])
-    }
 }
 
 task copyTextFiles(type: Copy) {