updated installation notes

INSTALL.md

@@ -113,17 +113,17 @@ First of all install the dependencies of Tox Core.
 
 Arch Linux:
 ```bash
-sudo pacman -S --needed opus libvpx
+sudo pacman -S --needed opus libvpx libsodium
 ```
 
 Debian / Ubuntu:
 ```bash
-sudo apt-get install libtool autotools-dev automake checkinstall check libopus-dev libvpx-dev
+sudo apt-get install libtool autotools-dev automake checkinstall check libopus-dev libvpx-dev libsodium-dev
 ```
 
 Fedora:
 ```bash
-sudo dnf install libtool autoconf automake check check-devel
+sudo dnf install libtool autoconf automake check check-devel libsodium-devel
 ```
 
 openSUSE:
@@ -137,10 +137,11 @@ You can grab SlackBuilds of the needed dependencies here:
 
 http://slackbuilds.org/repository/14.1/audio/opus/
 http://slackbuilds.org/repository/14.1/libraries/libvpx/
+http://slackbuilds.org/repository/14.1/libraries/libsodium/
 ```
 
 Now you can either follow the instructions at https://github.com/irungentoo/toxcore/blob/master/INSTALL.md#unix or use the "bootstrap.sh" script located at "/home/user/qTox".
-The script will automatically download and install Tox Core and libsodium to "/home/user/qTox/libs":
+The script will automatically download and install Tox Core and libfilteraudio:
 ```bash
 cd /home/user/qTox
 ./bootstrap.sh # use -h or --help for more information