Update readme (#89)

README.md

@@ -96,7 +96,7 @@ workflows:
 | `keystore_alias` | Alias of key inside `keystore_url`. | required, sensitive | `$BITRISEIO_ANDROID_KEYSTORE_ALIAS` |
 | `private_key_password` | If key password equals to keystore password (not recommended), you can leave it empty. Otherwise specify the private key password.  | sensitive | `$BITRISEIO_ANDROID_KEYSTORE_PRIVATE_KEY_PASSWORD` |
 | `page_align` | If enabled, it tells zipalign to use memory page alignment for stored shared object files.  - `automatic`: Enable page alignment for .so files, unless atribute `extractNativeLibs="true"` is set in the AndroidManifest.xml - `true`: Enable memory page alignment for .so files - `false`: Disable memory page alignment for .so files  | required | `automatic` |
-| `use_apk_signer` | Indicates if the signature should be done using `apksigner` instead of `jarsigner`. | required | `false` |
+| `signer_tool` | Indicates which tool should be used for signing the app.  - `automatic`: Uses the `apksigner` tool to sign an APK and `jarsigner` tool to sign an AAB file. - `apksigner`: Uses the `apksigner` tool to sign the app. - `jarsigner`: Uses the `jarsigner` tool to sign the app.  | required | `automatic` |
 | `signer_scheme` | If set, enforces which Signature Scheme should be used by the project.  - `automatic`: The tool uses the values of `--min-sdk-version` and `--max-sdk-version` to decide when to apply this Signature Scheme. - `v2`: Sets `--v2-signing-enabled` true, and determines whether apksigner signs the given APK package using the APK Signature Scheme v2. - `v3`: Sets `--v3-signing-enabled` true, and determines whether apksigner signs the given APK package using the APK Signature Scheme v3. - `v4`: Sets `--v4-signing-enabled` true, and determines whether apksigner signs the given APK package using the APK Signature Scheme v4. This scheme produces a signature in an separate file (apk-name.apk.idsig). If true and the APK is not signed, then a v2 or v3 signature is generated based on the values of `--min-sdk-version` and `--max-sdk-version`.  | required | `automatic` |
 | `debuggable_permitted` | Whether to permit signing `android:debuggable="true"` APKs. Android disables some of its security protections for such apps.  | required | `true` |
 | `output_name` | If empty, then the output name is `app-release-bitrise-signed`. Otherwise, it's the specified name. Do not add the file extension here.  |  |  |