added devtools installation

Author: ashleymaeconard

load_packages.R

@@ -1,3 +1,4 @@
+install.packages("devtools", repos="http://cran.us.r-project.org", dependencies = TRUE) # nolint
 install.packages("shiny", version = "1.7.1", repos="http://cran.us.r-project.org") # nolint
 install.packages("visNetwork", version = "2.1.0", repos="http://cran.us.r-project.org") # nolint
 install.packages("igraph", version = "1.3.5", repos="http://cran.us.r-project.org") # nolint
@@ -19,3 +20,4 @@ library(shinydashboard)
 library(shinydashboardPlus)
 library(shinyWidgets)
 library(shinyjs)
+library(devtools)