Bump com.android.billingclient library to v6.1.0

UPGRADING.md

@@ -1,5 +1,12 @@
 ## Upgrading Android In-App Billing v3 Library
 
+### Upgrading from 2.0.x to 2.1.0
+
+This release updates `com.android.billingclient:billing` library from version 4 to version 6.
+While your apps will probably continue to work, you still need to follow steps from official
+upgrade guide https://developer.android.com/google/play/billing/migrate-gpblv6 to make sure you're
+ready for future library updates from Google
+
 ### Upgrading from 1.x to 2.0.0
 
 Starting from Nov 1, 2021 Google will stop supporting v2 billing client library used as a dependency here.

library/build.gradle

@@ -33,7 +33,7 @@ dependencies {
     androidTestImplementation 'androidx.test:rules:1.4.0'
     androidTestImplementation 'androidx.test:runner:1.4.0'
     implementation 'androidx.annotation:annotation:1.3.0'
-    implementation 'com.android.billingclient:billing:4.0.0'
+    implementation 'com.android.billingclient:billing:6.1.0'
 }
 
 task androidJavadocs(type: Javadoc) {
@@ -68,7 +68,7 @@ afterEvaluate {
 
                 groupId = 'com.anjlab.android.iab.v3'
                 artifactId = 'library'
-                version = '2.0.3'
+                version = '2.1.0'
 
                 pom {
                     name = 'Android In-App Billing v3 Library'

sample/build.gradle

@@ -6,7 +6,7 @@ apply plugin: 'com.android.application'
 dependencies {
     implementation project(':library')
 //    implementation fileTree(dir: 'libs', include: '*.jar')
-//    implementation 'com.anjlab.android.iab.v3:library:2.0.0.1'
+//    implementation 'com.anjlab.android.iab.v3:library:2.1.0'
     implementation 'androidx.annotation:annotation:1.3.0'
 }