fix(lsp): use correct symbol for submodules

Fixes #413

Author: gnikit

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## Unreleased
 
+### Fixed
+
+- Fixed incorrect document symbol for `SUBMODULE` statements
+  ([#413](https://github.com/fortran-lang/fortls/issues/413))
+
 ## 3.1.1
 
 ### Fixed

fortls/langserver.py

@@ -279,7 +279,7 @@ def map_types(type):
 
     def serve_document_symbols(self, request: dict):
         def map_types(type, in_class: bool = False):
-            if type == 1:
+            if type in (1, 8):
                 return 2
             elif type in (2, 3):
                 if in_class: