Update azure-pipelines.yml for Azure Pipelines

.azure/azure-pipelines.yml

@@ -1,6 +1,12 @@
 resources:
 - repo: self
 
+pr:
+  branches:
+    include:
+    - master
+    - releases/*
+
 pool:
   vmImage: Hosted Ubuntu 1604
 #Your build pipeline references an undefined variable named ‘Parameters.RestoreBuildProjects’. Create or edit the build pipeline for this YAML file, define the variable on the Variables tab. See https://go.microsoft.com/fwlink/?linkid=865972