bump to version 1.4.7, including increase of minSdkVersion to 24 which requires Android 7+

BUILDING.md

@@ -1434,8 +1434,8 @@ The recommended way to build for Android is using the automated build script:
 ##### 1. Bump the version in package.json, then update these versions & run:
 
 ```bash
-perl -p -i -e 's/versionCode .*/versionCode 72/g' android/app/build.gradle
-perl -p -i -e 's/versionName .*/versionName "1.4.6"/g' android/app/build.gradle
+perl -p -i -e 's/versionCode .*/versionCode 73/g' android/app/build.gradle
+perl -p -i -e 's/versionName .*/versionName "1.4.7"/g' android/app/build.gradle
 ```
 
 ##### 2. Build
@@ -1446,13 +1446,13 @@ perl -p -i -e 's/versionName .*/versionName "1.4.6"/g' android/app/build.gradle
 npm run build:android:prod
 ```
 
-##### 3. Open the project in Android Studio
+##### 2.1. (Optional) Open the project in Android Studio
 
 ```bash
 npx cap open android
 ```
 
-##### 4. Use Android Studio to build and run on emulator or device
+##### 3. Use Android Studio to build and run on emulator or device
 
 #### Android Build from the console
 
@@ -1460,13 +1460,7 @@ npx cap open android
 
 * Note that this currently fails: `./gradlew build`
 
-To create the `aab` file, `bundle` instead of `build` (but not signed and not usable in Play Store):
-
-```bash
-./gradlew bundleDebug -Dlint.baselines.continue=true
-```
-
-So, to create a signed `aab` release:
+To create a signed `aab` release:
 
 - Setup by adding the app/gradle.properties.secrets file (see properties at top
   of app/build.gradle) and the app/time-safari-upload-key-pkcs12.jks file
@@ -1479,6 +1473,12 @@ So, to create a signed `aab` release:
 
 ... and find your `aab` file at app/build/outputs/bundle/release
 
+To create an unsigned debugging bundle (not usable in Play Store):
+
+```bash
+./gradlew bundleDebug -Dlint.baselines.continue=true
+```
+
 * Gradle packages whatever web bundle was last synced into
   `android/app/src/main/assets/public`, even one from a `--test` build. Before
   uploading, confirm it has production server defaults: