Release v1.1.0

Just a few bugfixes:

- Skip fields with `toml:"-"` even when they're unsupported types.
  Previously something like this would fail to encode due to `func`
  being an unsupported type:

      struct {
          Str  string `toml:"str"
          Func func() `toml:"-"`
      }

- Multiline strings can't end with `\`. This is valid:

      # Valid
      key = """ foo \
      """

	  # Invalid
	  key = """ foo \ """

- Don't quote values in `TOMLMarshaler`. Previously they would always
  include quoting (e.g. `"value"`), while the entire point of this
  interface is to bypass that.