修复搜索符号 ' 会闪退的问题。

close: #264

Controller/MessageListViewModel.swift

@@ -42,7 +42,7 @@ class MessageListViewModel: ViewModel, ViewModelType {
                 results = results.filter("group in %@", filterGroups)
             }
             if let text = searchText, text.count > 0 {
-                results = results.filter("title contains[c] '\(text)' or body contains[c] '\(text)'")
+                results = results.filter("title CONTAINS[c] %@ OR body CONTAINS[c] %@", text, text)
             }
             return results
         }