fix: allow hash in multiple queries (#468)

* feat: allow hash and string for params in multiple_queries

* Update search_client.rb

* Update search_client_test.rb

* Update search_client_test.rb

* Update search_client_test.rb

Author: DevinCodes

lib/algolia/search_client.rb

@@ -478,6 +478,9 @@ def multiple_get_objects(requests, opts = {})
       # @return [Hash]
       #
       def multiple_queries(queries, opts = {})
+        queries.each do |q|
+          q[:params] = to_query_string(q[:params]) unless q[:params].is_a?(String)
+        end
         @transporter.read(:POST, '/1/indexes/*/queries', { requests: queries }, opts)
       end
       alias_method :search, :multiple_queries

test/algolia/integration/search_client_test.rb

@@ -294,7 +294,7 @@ def test_multiple_operations
 
       results = @@search_client.multiple_queries([
         { indexName: index_name1, params: to_query_string({ query: '', hitsPerPage: 2 }) },
-        { indexName: index_name2, params: to_query_string({ query: '', hitsPerPage: 2 }) }
+        { indexName: index_name2, params: { query: '', hitsPerPage: 2 } }
       ], { strategy: 'none' })[:results]
 
       assert_equal 2, results.length