The read_faers() functions read FAERS data into a well formatted
tibble.
read_faers(path)(chr) path to the FAERS .txt to read.
a tibble for the FAERS table in path.
The read_faers() function can automaticaly read seven different
FAERS dataset: demo, drug, indi, outc, reac, rpsr and ther.
It convert and adapt dataset before version 2014Q4 with the new version.
Moreover, it adds a new coloums called 'period', in order to identify
the time release of dataset
  if (FALSE) {
    faers_db <- read_faers(
    path = "path_demo21Q1.txt"
    )
    demo_db <- read_demo(
    path = "path_demo21Q1.txt"
    )
    identical(faers_db, demo_db)
    #TRUE
  }