Reduce package dependencies

[dleutnant]

As the package acts as an interface, it dependency list should be as lightweight as possible. This issue aims to track changes in this respect.

library(tidyverse)
library(itdepends)

dep_usage_pkg("influxdbr") %>% 
  count(pkg, sort = TRUE)
#> # A tibble: 12 x 2
#>    pkg           n
#>    <chr>     <int>
#>  1 base       1030
#>  2 magrittr    111
#>  3 purrr        76
#>  4 dplyr        56
#>  5 influxdbr    54
#>  6 tibble        9
#>  7 tidyr         9
#>  8 xts           9
#>  9 httr          4
#> 10 jsonlite      2
#> 11 zoo           2
#> 12 rlang         1

^{Created on 2019-02-28 by the reprex package (v0.2.1)}