Complier warning with new release

[donalhenry]

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When building from either the master or develop branch (after release 0.31 created), I get the warning below:

$ gradlew clean jar
:clean
:compileJava
warning: No processor claimed any of these annotations: org.gradle.api.tasks.TaskAction,lombok.Setter,lombok.Getter,org.gradle.api.Nullable
/Users/dohenry/gradle_plugins/gradle-aws-plugin/src/main/java/jp/classmethod/aws/gradle/common/BasePluginExtension.java:41: warning: [unchecked] unchecked cast
        @Getter(lazy = true)
        ^
  required: T
  found:    Object
  where T is a type-variable:
    T extends AmazonWebServiceClient declared in class BasePluginExtension
2 warnings
:processResources
:classes
:jar

BUILD SUCCESSFUL

[glebsts]

https://github.com/rzwitserloot/lombok/issues/994 is the cause, I think.