fixed off-by-one (gotta love these lovely 1-based COM collections)

Rubberduck.Parsing/VBA/RubberduckParser.cs

@@ -165,7 +165,7 @@ private void LoadComReferences(IEnumerable<VBProject> projects)
             foreach (var vbProject in projects)
             {
                 var projectId = vbProject.ProjectId();
-                for (var priority = 0; priority < vbProject.References.Count; priority++)
+                for (var priority = 1; priority <= vbProject.References.Count; priority++)
                 {
                     var reference = vbProject.References.Item(priority);
                     var referenceId = reference.ReferenceId();