Fix typo (#2442)

6be3b90 added support for the `sslmode` parameter, not `ssl-mode`.

Author: sonicdoe

CHANGELOG.md

@@ -18,7 +18,7 @@ We do not include break-fix version release in this file.
 
 - Switch to optional peer dependencies & remove [semver](https://github.com/brianc/node-postgres/commit/a02dfac5ad2e2abf0dc3a9817f953938acdc19b1) package which has been a small thorn in the side of a few users.
 - Export `DatabaseError` from [pg-protocol](https://github.com/brianc/node-postgres/commit/58258430d52ee446721cc3e6611e26f8bcaa67f5).
-- Add support for `ssl-mode` in the [connection string](https://github.com/brianc/node-postgres/commit/6be3b9022f83efc721596cc41165afaa07bfceb0).
+- Add support for `sslmode` in the [connection string](https://github.com/brianc/node-postgres/commit/6be3b9022f83efc721596cc41165afaa07bfceb0).
 
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