Bump to newer haskell-tree-sitter.

Patrick Thomson · Patrick Thomson · commit 9a7cf9f3da09 · 2019-06-06T15:03:02.000-04:00
This should ensure we avoid issues like #96.
diff --git a/vendor/haskell-tree-sitter b/vendor/haskell-tree-sitter
@@ -1 +1 @@
-Subproject commit 38f8e36a83914f4fcfb2c8d4fa8769a9be038e25
+Subproject commit 498aa28c5c712377ae0c7fcd184f287e319633c5
