public Builder addInterceptor(Interceptor interceptor) {
            if (interceptors == null) {
                interceptors = new ArrayList<>();
            }
            interceptors.add(interceptor);
            return this;
        }
Add an interceptor.

@param interceptor the interceptor to add
@return the builder
@since 1.3.0
android/android_framework/base/src/main/java/com/elvishew/xlog/LogConfiguration.java