fix: type and sql for insert version

src/import_data.jl

@@ -1,3 +1,8 @@
+"""
+    insert_version_info(db::SQLite.DB)
+
+Insert version information of this software as string.
+"""
 function insert_version_info(db::SQLite.DB)
     stmt = DBInterface.prepare(
         db,
@@ -5,7 +10,7 @@ function insert_version_info(db::SQLite.DB)
         INSERT INTO versions VALUES (:converter)
         """,
     )
-    DBInterface.execute(stmt, (; converter = pkgversion(@__MODULE__)))
+    DBInterface.execute(stmt, (; converter = pkgversion(@__MODULE__) |> string))
 
     nothing
 end

src/sql/create_table.sql

@@ -1,5 +1,5 @@
 CREATE TABLE versions (
-  converter TEXT,
+  converter TEXT
 );
 
 CREATE TABLE ps_boards (