Add test for moved file

[MichaelCurrin]

it('should handle a moved file', function () {
      const changes: FileChanges[] = [
        {
          x: ACTION.R,
          y: " ",
          from: "foo.txt",
          to: "bar/foo.txt"
        }
      ]
      const expected = {
        move: 1
      }

      assert.deepStrictEqual(
        count(changes), expected)
    })