gg_subseries facets should preserve order

[mitchelloharawild]

library(tsibble)
#> 
#> Attaching package: 'tsibble'
#> The following objects are masked from 'package:stats':
#> 
#>     filter, lag
library(feasts)
#> 
#> Attaching package: 'feasts'
#> The following object is masked from 'package:grDevices':
#> 
#>     X11
pedestrian %>% 
  index_by(Date) %>% 
  summarise(Count = sum(Count)) %>% 
  gg_subseries(Count)

^{Created on 2019-04-02 by the reprex package (v0.2.1)}