Update minimum SDK and document minimum Android version

Author: joshafeinberg

README.md

@@ -18,6 +18,10 @@ Documentation: [Javadocs](https://dropbox.github.io/dropbox-sdk-java/api-docs/v5
 
 The current release of Dropbox SDK Java supports Java 8+.
 
+### Android Version
+
+The current release of Dropbox SDK Java supports Android 8+ (SDK 26+)
+
 ### Add a dependency on the Dropbox Java SDK to your project
 
 If you're using Maven, then edit your project's "pom.xml" and add this to the `<dependencies>` section:

gradle/dropboxJavaSdkLibs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 android-compile-sdk = "33"
 android-gradle-plugin = "7.4.2"
-android-min-sdk = "21"
+android-min-sdk = "26"
 android-target-sdk = "33"
 androidx-activity = "1.5.0"
 binary-compatibility-validator = "0.11.1"