Add Update method. Other fixes.

Author: DiegoGalante

AzureDevopsTracker/Services/AzureDevopsTrackerService.cs

@@ -233,6 +233,9 @@ public async Task Create(string jsonText, bool addWorkItemChange = true)
                     return;
 
                 workItem.AddCustomFields(customFields);
+
+                _workItemRepository.Update(workItem);
+                await _workItemRepository.SaveChangesAsync();
             }
             catch
             { }
@@ -254,6 +257,9 @@ public async Task Update(string jsonText)
                     return;
 
                 workItem.UpdateCustomFields(customFields);
+
+                _workItemRepository.Update(workItem);
+                await _workItemRepository.SaveChangesAsync();
             }
             catch
             { }