Update 31.1.17.md

Author: Hema1201

ej2-javascript/Release-notes/31.1.17.md

@@ -34,6 +34,7 @@ documentation: ug
 | CircularGauge | 429 | 429 | 0 | All Passed |
 | ColorPicker | 130 | 130 | 0 | All Passed |
 | Common | 849 | 849 | 0 | All Passed |
+| Combo Box | 85 | 85 | 0 | All Passed |
 | Context Menu | 105 | 105 | 0 | All Passed |
 | Data Grid | 2754 | 2754 | 0 | All Passed |
 | Date Picker | 425 | 425 | 0 | All Passed |