Added possibility to delete a worklog

Author: Christoffer Pettersson

README.md

@@ -117,6 +117,7 @@ JiraApi options:
     *  Set Max Results
     *  Set Start-At parameter for results
   *  Add a worklog
+  *  Delete a worklog
   *  Add new estimate for worklog
   *  Add a comment
   *  Remote links (aka Web Links)

lib/jira.js

@@ -1557,6 +1557,47 @@ var JiraApi = exports.JiraApi = function(protocol, host, port, username, passwor
         });
     };
 
+    // ## Delete worklog from issue ##
+    // ### Takes ###
+    //
+    // *  issueId: the Id of the issue to delete
+    // *  worklogId: the Id of the worklog in issue to delete
+    // *  callback: for when it's done
+    //
+    // ### Returns ###
+    // *  error string
+    // *  success object
+    //
+    // [Jira Doc](https://docs.atlassian.com/jira/REST/latest/#d2e1673)
+
+    this.deleteWorklog = function(issueId, worklogId, callback) {
+
+        var options = {
+            rejectUnauthorized: this.strictSSL,
+            uri: this.makeUri('/issue/' + issueId + '/worklog/' + worklogId),
+            method: 'DELETE',
+            followAllRedirects: true,
+            json: true
+        };
+
+        this.doRequest(options, function(error, response) {
+
+            if (error) {
+                callback(error, null);
+                return;
+            }
+
+            if (response.statusCode === 204) {
+                callback(null, "Success");
+                return;
+            }
+
+            callback(response.statusCode + ': Error while deleting');
+
+        });
+
+    };
+
     // ## List all Issue Types ##
     // ### Takes ###
     //