Feature request: pass a vector to move()

I would like to be able to pass a character vector to move(). This works: 

```r
game() %>%
    move("e4", "c5", "Nf3", "e6", "d3", "Nc6", "g3", "Nf6")
```

But this does not:
```r
test_moves <- c("e4", "c5", "Nf3", "e6", "d3", "Nc6", "g3", "Nf6")

game() %>%
    move(test_moves)
```
