Prepare 3.1.5 release (#164)

## [3.1.5] - 2022-05-05

### Fixed
- Prevent `NullPointerException` when event buffer is full and `diagnosticOptOut` is true. (Thanks, [mattyway](#160)!)

CHANGELOG.md

@@ -3,6 +3,11 @@
 
 All notable changes to the LaunchDarkly Android SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [3.1.5] - 2022-05-05
+
+### Fixed
+- Prevent `NullPointerException` when event buffer is full and `diagnosticOptOut` is true. (Thanks, [mattyway](https://github.com/launchdarkly/android-client-sdk/pull/160)!)
+
 ## [3.1.4] - 2022-03-23
 ### Fixed
 - Removed Android Appcompat dependency.

example/build.gradle

@@ -29,5 +29,5 @@ dependencies {
 
     implementation(project(":launchdarkly-android-client-sdk"))
     // Comment the previous line and uncomment this one to depend on the published artifact:
-    //implementation("com.launchdarkly:launchdarkly-android-client-sdk:3.1.4")
+    //implementation("com.launchdarkly:launchdarkly-android-client-sdk:3.1.5")
 }

gradle.properties

@@ -16,7 +16,7 @@
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
-version=3.1.4
+version=3.1.5
 
 sonatypeUsername=
 sonatypePassword=