Update release-notes-reporting-services.md

Adding ChangeLog notes for April 6, 2020 CU release of RS2017
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cc: @casualoak

Author: jwilson-msft

docs/reporting-services/release-notes-reporting-services.md

@@ -45,7 +45,17 @@ We are "standardizing" all our 'Release Notes' style articles:
 
 GeneMi, DevOps = 1467988 (MsEng > TechnicalContent) , 2019/03/19
 -->
-## 14.0.600.1451 2019/11/13 
+## 14.0.600.1572, 2020/04/06 
+
+| Fixed issue | Details |
+| :---------- | :------ |
+| Updated JQuery UI to 1.12  |   |
+| Fixed URL case-sensitivity  |   |
+| Fixed Parameter placement when there are many parameters  |   |
+| Fixed FindString not working in HTML5 rendering  |   |
+| Analysis Services Client Libraries updated to address TLS 1.0/1.1 deprecation |   |
+
+## 14.0.600.1451, 2019/11/13 
 
 | Fixed issue | Details |
 | :---------- | :------ |