Accept gradle Terms of Service

Issue gh-94

build.gradle

@@ -20,4 +20,11 @@ allprojects {
 			}
 		}
 	}
-}
+}
+
+if (hasProperty('buildScan')) {
+	buildScan {
+		termsOfServiceUrl = 'https://gradle.com/terms-of-service'
+		termsOfServiceAgree = 'yes'
+	}
+}