Merge pull request rsim#191 from yahonda/fixnum_and_bignum_are_deprecated

Fixnum and Bignum are deprecated in Ruby 2.4

Author: yahonda

lib/plsql/jdbc_connection.rb

@@ -223,8 +223,6 @@ def prepare_call(sql, *bindvars)
     end
 
     RUBY_CLASS_TO_SQL_TYPE = {
-      Fixnum => java.sql.Types::INTEGER,
-      Bignum => java.sql.Types::INTEGER,
       Integer => java.sql.Types::INTEGER,
       Float => java.sql.Types::FLOAT,
       BigDecimal => java.sql.Types::NUMERIC,