FIX: Stop using BigDecimal.new which is deprecated in Ruby 2.6

FIX: Stop using BigDecimal.new which is deprecated in Ruby 2.6

Instead the usage that is supported is BigDecimal(string)

diff --git a/lib/mini_sql/postgres/coders.rb b/lib/mini_sql/postgres/coders.rb
index 9a7e8fd..e9e65ec 100644
--- a/lib/mini_sql/postgres/coders.rb
+++ b/lib/mini_sql/postgres/coders.rb
@@ -3,7 +3,7 @@ module MiniSql
     module Coders
       class NumericCoder < PG::SimpleDecoder
         def decode(string, tuple = nil, field = nil)
-          BigDecimal.new(string)
+          BigDecimal(string)
         end
       end

GitHub sha: e6bfd30c