0.02 2022-09-14
  [Document Improvement]
    * Add Sys::FileTest doc.
  [Incompatible Changes]
    * Remove Sys::IO->freopen.
    * Simplify the implementation of the methods for file test in Sys::FileTest
      If the file doesn't exists, an exception will be thrown except for e.
  [Changes]
    * Use access function for Sys::FileTest->e.
  [Bug Fix]
    * Fix the bug that ouble free or corruption (!prev) occur in Sys::IO->stat in Linux/Ubuntu 32bit.
      
0.01 2022-09-13
  
  * First experimental release