Update typespecs for Cachex.put/4 and Cachex.put_many/3

[arcanemachine]

These functions both define a return type of {status, boolean}:

  @spec put(Cachex.t(), any, any, Keyword.t()) :: {status, boolean}
  def put(cache, key, value, options \\ []) when is_list(options),

  # ...

  @spec put_many(Cachex.t(), [{any, any}], Keyword.t()) :: {status, boolean}
  def put_many(cache, pairs, options \\ [])

However, both functions may return a non-boolean value as the second element in the tuple, e.g. when an invalid cache name is given:

 iex> Cachex.put(:hello, :world, :ok)
{:error, :no_cache}

 iex> Cachex.put_many(:hello, [{:world, :ok}])
{:error, :no_cache}

This pull requests loosens the return type for these functions to use {status, any}.