message: docs: change versions of gcc and g++
diff: @@ -7,8 +7,8 @@ architecture | x86_64
  disk size | according to size of dataset
  memory size | according to size of dataset
  glibc | version >= 2.14
  -gcc | version >= 4.4.7
  -g++ | version >= 4.4.7
  +gcc | version >= 4.8
  +g++ | version >= 4.8
  make | need to be installed
  boost | version >= 1.54
  readline | need to be installed
  