message: Update build-unix.md
  add libsodium-dev missing ...
diff: @@ -65,7 +65,7 @@ Dependency Build Instructions: Ubuntu & Debian
  ----------------------------------------------
  Build requirements:
  - sudo apt-get install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils
  + sudo apt-get install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils libsodium-dev
  Options when installing required Boost library files:
  