make compatible with php 5.x

Author: dominikkukacka

sdk/Eversign/LogEntry.php

@@ -68,7 +68,7 @@ public function getSigner() {
         return $this->signer;
     }
 
-    public function getTimestamp(): \DateTime {
+    public function getTimestamp() {
         return $this->timestamp;
     }
 

sdk/Eversign/Template.php

@@ -174,7 +174,7 @@ public function getClient() {
         return $this->client;
     }
 
-    public function getExpires(): \DateTime {
+    public function getExpires() {
         return $this->expires;
     }
 
@@ -190,7 +190,6 @@ public function getFields() {
         return $this->fields;
     }
 
-
     public function setTemplateId($templateId) {
         $this->templateId = $templateId;
     }