Update PROTOCOL.md

Author: marcobambini

PROTOCOL.md

@@ -74,8 +74,8 @@ The format is `*LEN 0:VERS NROWS NCOLS DATA`. The whole command is built by ten
 2. LEN is a string representation of Rowset length (theoretically the maximum supported value is UINT64_MAX but it is usually much lower. LEN does not include the length of the first `*LEN ` part.
 3. A single space is used to separate LEN from 0:VERS
 4. a single `0:` string followed by a VERS number (a string representation of the number) which specifies the version of the Rowset.
-   * `0`: means that only column names are included in the header
-   * `1`: means that column names, declared types, database names, table names, origin names, not null flags, primary key flags and autoincrement flags are included in the header (one value for each column)
+   * `1`: means that only column names are included in the header
+   * `2`: means that column names, declared types, database names, table names, origin names, not null flags, primary key flags and autoincrement flags are included in the header (one value for each column)
 5. A single space is used to separate 0:VERS from NROWS
 6. NROWS  is a string representation of the number of rows contained in the Rowset (can be zero)
 7. A single space is used to separate NROWS from NCOLS