HistogramsTest: make it easier to identify failing test

Author: smola

dd-trace-core/src/test/groovy/datadog/trace/core/histogram/HistogramsTest.groovy

@@ -36,7 +36,7 @@ class HistogramsTest extends DDSpecification {
   @Shared
   Double[] quantiles = [0.5D, 0.75D, 0.9D, 0.95D, 0.99D]
 
-  def "test quantiles have 1% relative error #iterationIndex"() {
+  def "test quantiles have 1% relative error #iterationIndex #scenario #size"() {
     setup:
     def histogram