Fix y-axis labelling for periods

[TimTaylor]

see labelling issue on y-axis below

library(outbreaks)
library(incidence2)
dat <- ebola_sim_clean$linelist
x2w<- incidence(dat, date_of_onset, interval = "2 weeks")
x2w
#> An incidence2 object: 28 x 2
#> 5829 cases from 2014-04-07 to 2015-05-03
#> interval: 14 days
#> cumulative: FALSE
#> 
#>    date_index               count
#>    <period>                 <int>
#>  1 2014-04-07 to 2014-04-20     2
#>  2 2014-04-21 to 2014-05-04     9
#>  3 2014-05-05 to 2014-05-18    29
#>  4 2014-05-19 to 2014-06-01    34
#>  5 2014-06-02 to 2014-06-15    44
#>  6 2014-06-16 to 2014-06-29    52
#>  7 2014-06-30 to 2014-07-13    72
#>  8 2014-07-14 to 2014-07-27   120
#>  9 2014-07-28 to 2014-08-10   166
#> 10 2014-08-11 to 2014-08-24   255
#> # … with 18 more rows
plot(x2w, color = "white")

^{Created on 2021-05-20 by the reprex package (v2.0.0)}

[TimTaylor]

Now fixed