Accept JqlFunction in jql query add expression method (#105)

* Accept JqlFunction in jql query add expression method

* fix spaces in php doc

Author: lotimopa

src/Issue/JqlQuery.php

@@ -528,16 +528,16 @@ public function addAnyExpression(string $expression): self
      * Do not use this method with array values.
      * Use addInExpression, addNotInExpression or addAnyExpression instead.
      *
-     * @param string $field            field name
-     * @param string $operator         supported scalar operator (see OPERATOR_ constants.
-     *                                 {@see JqlQuery::OPERATOR_EQUALS} etc.)
-     * @param string $value            field value
-     * @param string $logicLinkKeyword use {@see JqlQuery::KEYWORD_AND} or {@see JqlQuery::KEYWORD_OR}
-     *                                 to set join logical operation. Default {@see JqlQuery::KEYWORD_AND}.
+     * @param string             $field            field name
+     * @param string             $operator         supported scalar operator (see OPERATOR_ constants.
+     *                                             {@see JqlQuery::OPERATOR_EQUALS} etc.)
+     * @param string|JqlFunction $value            field value
+     * @param string             $logicLinkKeyword use {@see JqlQuery::KEYWORD_AND} or {@see JqlQuery::KEYWORD_OR}
+     *                                             to set join logical operation. Default {@see JqlQuery::KEYWORD_AND}.
      *
      * @return JqlQuery
      */
-    public function addExpression(string $field, string $operator, string $value, string $logicLinkKeyword = self::KEYWORD_AND): self
+    public function addExpression(string $field, string $operator, string|JqlFunction $value, string $logicLinkKeyword = self::KEYWORD_AND): self
     {
         $this->joinExpression(
             self::quoteField($field)." $operator ".self::quote($value),