toml.encode errors for integer data types other than int64 or singles

[pavdpr]

The integer data types other than int64 are not supported for encoding

Running

types = { ...
   @double; ...
   @single; ...
   @int8; ...
   @int16; ...
   @int32; ...
   @int64; ...
   @uint8; ...
   @uint16; ...
   @uint32; ...
   @uint64; ...
};

fprintf("| %-6s | %s | \n", "Type", " OK ");
fprintf("|-%-6s-|-%s-| \n", "------", "----");
for i = 1:numel(types)
   try
      toml.encode(struct('key', types{i}(1)));
      fprintf("| %-6s | %s | \n", func2str(types{i}), "Pass");
   catch
      fprintf("| %-6s | %s |\n", func2str(types{i}), "Fail");
   end
end

Type	OK
double	Pass
single	Fail
int8	Fail
int16	Fail
int32	Fail
int64	Pass
uint8	Fail
uint16	Fail
uint32	Fail
uint64	Fail

[pavdpr]

Proposed fix: #36