tidyverse deprecations

```
> library(streamMetabolizer)
USGS Active Research Package:
https://owi.usgs.gov/R/packages.html#research
This package was developed for research purposes. We used it for our
own applications and welcome flexible, resilient users who can help us
test and improve the package. Please give us feedback at
https://github.com/USGS-R/streamMetabolizer/issues/new.
> dat <- data_metab()
Warning message:
`rename_vars()` is deprecated as of dplyr 0.8.4.
Please use `tidyselect::vars_rename()` instead.
This warning is displayed once every 8 hours.
Call `lifecycle::last_warnings()` to see where this warning was generated.
> mm <- metab(specs(mm_name()), dat)
Warning messages:
1: `select_()` is deprecated as of dplyr 0.7.0.
Please use `select()` instead.
This warning is displayed once every 8 hours.
Call `lifecycle::last_warnings()` to see where this warning was generated.
2: `select_vars()` is deprecated as of dplyr 0.8.4.
Please use `tidyselect::vars_select()` instead.
This warning is displayed once every 8 hours.
Call `lifecycle::last_warnings()` to see where this warning was generated.
3: `rename_()` is deprecated as of dplyr 0.7.0.
Please use `rename()` instead.
This warning is displayed once every 8 hours.
Call `lifecycle::last_warnings()` to see where this warning was generated.
```

with
```
> devtools::session_info()
─ Session info ──────────────────────────────────────────────────────────────────────────────────────────────────────────────
setting value
version R version 4.0.2 (2020-06-22)
os macOS Mojave 10.14.6
system x86_64, darwin17.0
ui RStudio
language (EN)
collate en_US.UTF-8
ctype en_US.UTF-8
tz America/New_York
date 2020-12-01

─ Packages ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────
package * version date lib source
assertthat 0.2.1 2019-03-21 [1] CRAN (R 4.0.2)
backports 1.2.0 2020-11-02 [1] CRAN (R 4.0.2)
callr 3.5.1 2020-10-13 [1] CRAN (R 4.0.2)
cli 2.1.0 2020-10-12 [1] CRAN (R 4.0.2)
crayon 1.3.4 2017-09-16 [1] CRAN (R 4.0.2)
desc 1.2.0 2018-05-01 [1] CRAN (R 4.0.2)
deSolve 1.28 2020-03-08 [1] CRAN (R 4.0.2)
devtools 2.3.2 2020-09-18 [1] CRAN (R 4.0.2)
digest 0.6.27 2020-10-24 [1] CRAN (R 4.0.2)
dplyr 1.0.2 2020-08-18 [1] CRAN (R 4.0.2)
ellipsis 0.3.1 2020-05-15 [1] CRAN (R 4.0.2)
fansi 0.4.1 2020-01-08 [1] CRAN (R 4.0.2)
fs 1.5.0 2020-07-31 [1] CRAN (R 4.0.2)
generics 0.1.0 2020-10-31 [1] CRAN (R 4.0.2)
glue 1.4.2 2020-08-27 [1] CRAN (R 4.0.2)
LakeMetabolizer 1.5.0 2016-06-23 [1] CRAN (R 4.0.2)
lazyeval 0.2.2 2019-03-15 [1] CRAN (R 4.0.2)
lifecycle 0.2.0 2020-03-06 [1] CRAN (R 4.0.2)
lubridate 1.7.9.2 2020-11-13 [1] CRAN (R 4.0.2)
magrittr 2.0.1 2020-11-17 [1] CRAN (R 4.0.2)
memoise 1.1.0 2017-04-21 [1] CRAN (R 4.0.2)
pillar 1.4.6 2020-07-10 [1] CRAN (R 4.0.2)
pkgbuild 1.1.0 2020-07-13 [1] CRAN (R 4.0.2)
pkgconfig 2.0.3 2019-09-22 [1] CRAN (R 4.0.2)
pkgload 1.1.0 2020-05-29 [1] CRAN (R 4.0.2)
plyr 1.8.6 2020-03-03 [1] CRAN (R 4.0.2)
prettyunits 1.1.1 2020-01-24 [1] CRAN (R 4.0.2)
processx 3.4.4 2020-09-03 [1] CRAN (R 4.0.2)
ps 1.4.0 2020-10-07 [1] CRAN (R 4.0.2)
purrr 0.3.4 2020-04-17 [1] CRAN (R 4.0.2)
R6 2.5.0 2020-10-28 [1] CRAN (R 4.0.2)
Rcpp 1.0.5 2020-07-06 [1] CRAN (R 4.0.2)
remotes 2.2.0 2020-07-21 [1] CRAN (R 4.0.2)
rLakeAnalyzer 1.11.4.1 2019-06-09 [1] CRAN (R 4.0.2)
rlang 0.4.8 2020-10-08 [1] CRAN (R 4.0.2)
rprojroot 1.3-2 2018-01-03 [1] CRAN (R 4.0.2)
rstudioapi 0.13 2020-11-12 [1] CRAN (R 4.0.2)
sessioninfo 1.1.1 2018-11-05 [1] CRAN (R 4.0.2)
streamMetabolizer * 0.11.4 2020-11-09 [1] Github (USGS-R/streamMetabolizer@4a7ba9c)
testthat 3.0.0 2020-10-31 [1] CRAN (R 4.0.2)
tibble 3.0.4 2020-10-12 [1] CRAN (R 4.0.2)
tidyr 1.1.2 2020-08-27 [1] CRAN (R 4.0.2)
tidyselect 1.1.0 2020-05-11 [1] CRAN (R 4.0.2)
unitted 0.2.9 2020-05-28 [1] local
usethis 1.6.3 2020-09-17 [1] CRAN (R 4.0.2)
vctrs 0.3.5 2020-11-17 [1] CRAN (R 4.0.2)
withr 2.3.0 2020-09-22 [1] CRAN (R 4.0.2)

[1] /Library/Frameworks/R.framework/Versions/4.0/Resources/library
```