Update COMPAT.md

COMPAT.md

@@ -1,12 +1,12 @@
-# Compatibility with SQLite
+# Limbo compatibility with SQLite
 
 This document describes the compatibility of Limbo with SQLite.
 
-## Table of contents:
+## Table of contents
 
-- [Compatibility with SQLite](#compatibility-with-sqlite)
-  - [Table of contents:](#table-of-contents)
-  - [Features](#features)
+  - [Overview](#overview)
+    - [Features](#features)
+    - [Limitations](#limitations)
   - [SQLite query language](#sqlite-query-language)
     - [Statements](#statements)
       - [PRAGMA](#pragma)
@@ -26,16 +26,24 @@ This document describes the compatibility of Limbo with SQLite.
     - [Vector](#vector)
     - [Time](#time)
 
-## Features
+## Overview
 
 Limbo aims to be fully compatible with SQLite, with opt-in features not supported by SQLite.
 
-The current status of Limbo is:
+### Features
+
+* ✅ SQLite file format is fully supported
+* 🚧 SQLite query language [[status](#sqlite-query-language)] is partially supported
+* 🚧 SQLite C API [[status](#sqlite-c-api)] is partially supported
+
+### Limitations
 
-* ✅ SQLite file format is fully supported.
-* 🚧 SQLite query language [[status](#sqlite-query-language)]
-* 🚧 SQLite C API [[status](#sqlite-c-api)].
 * ⛔️ Concurrent access from multiple processes is not supported.
+* ⛔️ Savepoints are not supported.
+* ⛔️ Triggers are not supported.
+* ⛔️ Indexes are not supported.
+* ⛔️ Views are not supported.
+* ⛔️ Vacuum is not supported.
 
 ## SQLite query language