檢視包版本

條件：應至少安裝包裝。如果未在當前會話中載入，則不成問題。

  ## Checking package version which was installed at past or 
  ## installed currently but not loaded in the current session

  packageVersion("seqinr")
  # [1] ‘3.3.3’
  packageVersion("RWeka")
  # [1] ‘0.4.29’