Typo in Model.php (#1068)

Relatinoships -> relationships

src/Jenssegers/Mongodb/Eloquent/Model.php

@@ -115,7 +115,7 @@ abstract class Model extends BaseModel
     {
         // If no relation name was given, we will use this debug backtrace to extract
         // the calling method's name and use that as the relationship name as most
-        // of the time this will be what we desire to use for the relatinoships.
+        // of the time this will be what we desire to use for the relationships.
         if (is_null($relation)) {
             list(, $caller) = debug_backtrace(false);