require instance_cache.rb

Author: suketa

lib/duckdb.rb

@@ -15,6 +15,7 @@
 require 'duckdb/column'
 require 'duckdb/logical_type'
 require 'duckdb/infinity'
+require 'duckdb/instance_cache'
 
 # DuckDB provides Ruby interface of DuckDB.
 module DuckDB