Fix warnings (#27)

Author: petterh

README.md

@@ -6,7 +6,7 @@
 |---|---|
 | [![Build Status](https://dev.azure.com/petter0012/react-native-android-activity/_apis/build/status/petterh.react-native-android-activity?branchName=master)](https://dev.azure.com/petter0012/react-native-android-activity/_build/latest?definitionId=1&branchName=master) | [[![Build Status](https://dev.azure.com/petter0012/react-native-android-activity/_apis/build/status/petterh.react-native-android-activity%20(1)?branchName=master)](https://dev.azure.com/petter0012/react-native-android-activity/_build/latest?definitionId=2&branchName=master) |
 
-This sample, which grew out of a [question on Stack Overflow](https://stackoverflow.com/questions/42253397/call-android-activity-from-react-native-code/43675819), demonstrates the interface between React Native JavaScript and Java code in host applications.
+This sample, which grew out of a [question on Stack Overflow](https://stackoverflow.com/questions/42253397/call-android-activity-from-react-native-code/43675819), demonstrates the interface between React Native JavaScript and Java code in Android host applications/Objective-C in iOS applications.
 
 The original version was Android-only; support for iOS was added March 28 2019.
 

android/app/src/main/java/com/demo/activity/MainApplication.java

@@ -14,8 +14,6 @@
 import java.util.Arrays;
 import java.util.List;
 
-import javax.annotation.Nullable;
-
 /**
  * Base class for maintaining global application state -- in this case, the {@link ReactNativeHost}.
  */

android/settings.gradle

@@ -1,7 +1,7 @@
 rootProject.name = 'ReactNativeActivityDemo'
 
 // https://react-native-community.github.io/upgrade-helper/?from=0.59.10&to=0.60.0
-apply from: file("../node_modules/@react-native-community/cli-platform-android/native_modules.gradle");
+apply from: file("../node_modules/@react-native-community/cli-platform-android/native_modules.gradle")
 applyNativeModulesSettingsGradle(settings)
 
 include ':app'