ig_search_users: Search by Username
Description
This function accepts a username, without the "@" symbol and finds matching 
user profiles. This is helpful when you do not know a user's name exactly and 
need to get their user_id. If you know the username exactly then you can
use ig_get_user_profile to pull the profile information without searching.
Usage
ig_search_users(username, max_id = NULL, return_df = TRUE,
  paginate = TRUE, max_pages = 10, verbose = FALSE)
Arguments
username
character; the username of the Instagram user. Omit the "@" symbol 
that is typically used when referencing another user
max_id
integer; the unique id identifying the oldest post that you 
would want to retrieve in this function call
return_df
logical; do you want to return the results as a tbl_df 
with one row per entity or as a list with one element per entity?
paginate
logical; do you want to paginate through results or just return 
the first page?
max_pages
integer; a limit to the number of pages to retrieve from 
paginated endpoints. Instagram feeds have the potential to paginate forever, 
so by default we stop after pulling 10 pages. If you would like more or less 
pages returned, then modify this argument.
verbose
logical; do you want informative messages?
Examples
Run this code# NOT RUN {
# search for usernames like Justin Bieber
bieber_users <- ig_search_users("justinbieb")
# }
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