chartSeries does not honor show.grid parameter

[ethanbsmith]

Description

chartSeries draw grid lines even when show.grid is passed as FALSE. a quick scan of the code shows that this parameter is never used

Minimal, reproducible example

chartSeries(getSymbols("SPY", auto.assign = F, env = NULL), show.grid = F)

Session Info

> sessionInfo()
R version 3.4.1 (2017-06-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 14393)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252 LC_NUMERIC=C                           LC_TIME=English_United States.1252    

attached base packages:
[1] parallel  stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] dbscan_1.1-1         jsonlite_1.4         curl_2.6             data.table_1.10.4    quantmod_0.4-11      TTR_0.23-2           xts_0.10-0           zoo_1.8-0            RODBC_1.3-15         doParallel_1.0.10   
[11] iterators_1.0.8      foreach_1.4.4        plotrix_3.6-6        RevoUtilsMath_10.0.0 RevoUtils_10.0.5     RevoMods_11.0.0      MicrosoftML_1.5.0    mrsdeploy_1.1.2      RevoScaleR_9.2.1     lattice_0.20-35     
[21] rpart_4.1-11         checkpoint_0.4.0    

loaded via a namespace (and not attached):
[1] Rcpp_0.12.13           CompatibilityAPI_1.1.0 rtvs_1.0.0.0           R6_2.2.0               tools_3.4.1            grid_3.4.1             mrupdate_1.0.1         codetools_0.2-15       compiler_3.4.1