Add release note for external module DSL
Add release note for external module DSL

+review REVIEW-5650

gradle/gradle,lsmaira/gradle,robinverduijn/gradle,robinverduijn/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,gradle/gradle,gstevey/gradle,gstevey/gradle,gradle/gradle,robinverduijn/gradle,lsmaira/gradle,blindpirate/gradle,lsmaira/gradle,robinverduijn/gradle,gstevey/gradle,blindpirate/gradle,gstevey/gradle,gradle/gradle,robinverduijn/gradle,blindpirate/gradle,lsmaira/gradle,gradle/gradle,gradle/gradle,robinverduijn/gradle,robinverduijn/gradle,gradle/gradle,robinverduijn/gradle,lsmaira/gradle,blindpirate/gradle,lsmaira/gradle,gstevey/gradle,gradle/gradle,blindpirate/gradle,gstevey/gradle,gradle/gradle,gstevey/gradle,lsmaira/gradle,blindpirate/gradle,lsmaira/gradle,robinverduijn/gradle,lsmaira/gradle,robinverduijn/gradle,robinverduijn/gradle,blindpirate/gradle,gstevey/gradle,gstevey/gradle,blindpirate/gradle,lsmaira/gradle