Fix write query detection to recognise INSERT. (#205)

* Fix write query detection to recognise `INSERT`.

```cypher
INSERT (n:ThisIsValidCypher) RETURN n
```

obviously, this here too

```MATCH (n:Merge) RETURN n```

figuring out whether a query is read only or not with a regex will be kinda problematic in the long run.

* Update CHANGELOG.md

---------

Co-authored-by: alex <[email protected]>

Author: michael-simons

servers/mcp-neo4j-cypher/CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Changed
 
 ### Added
+* Update write query detection to include `INSERT` in regex check
 
 ## v0.4.1
 

servers/mcp-neo4j-cypher/src/mcp_neo4j_cypher/server.py

@@ -32,7 +32,7 @@ def _format_namespace(namespace: str) -> str:
 def _is_write_query(query: str) -> bool:
     """Check if the query is a write query."""
     return (
-        re.search(r"\b(MERGE|CREATE|SET|DELETE|REMOVE|ADD)\b", query, re.IGNORECASE)
+        re.search(r"\b(MERGE|CREATE|INSERT|SET|DELETE|REMOVE|ADD)\b", query, re.IGNORECASE)
         is not None
     )