feat: make connection parameters optional

Author: Ziinc

README.md

@@ -1,4 +1,4 @@
-# libcluster Postgres Strategy
+# Libcluster Postgres Strategy
 
 [![Hex version badge](https://img.shields.io/hexpm/v/libcluster_postgres.svg)](https://hex.pm/packages/libcluster_postgres)
 [![License badge](https://img.shields.io/hexpm/l/libcluster_postgres.svg)](https://github.com/supabase/libcluster_postgres/blob/main/LICENSE)
@@ -38,6 +38,7 @@ config :libcluster,
           password: "postgres",
           database: "postgres",
           port: 5432,
+          # optional, connection parameters. Defaults to []
           parameters: [],
           # optional, defaults to false
           ssl: true,

lib/strategy.ex

@@ -34,7 +34,7 @@ defmodule LibclusterPostgres.Strategy do
       port: Keyword.fetch!(state.config, :port),
       ssl: Keyword.get(state.config, :ssl),
       ssl_opts: Keyword.get(state.config, :ssl_opts),
-      parameters: Keyword.fetch!(state.config, :parameters),
+      parameters: Keyword.get(state.config, :parameters, []),
       channel_name: channel_name
     ]