message: README.md improvements
diff: @@ -8,13 +8,19 @@ The latest release is [1.3.3](https://github.com/spectrecoin/spectre/releases/ta
  Building on Linux
  -----------------
  +**To build a stable wallet from source, please download the source code of the latest release from the [releases page](https://github.com/spectrecoin/spectre/releases). Building from the master branch (the development code for the next release) should only be done if you plan to work on the code and understand the risks.**
  +
  We do not currently provide Linux binary packages. To build the SpectreCoin wallet from source, you will need the following dependencies:
  * OpenSSL 1.0
  * libevent
  + * libseccomp
  + * libcap
  * boost
  * Qt 4 if you want to build the GUI wallet. Qt is not needed for the console wallet.
  +Additionally, you'll need a C/C++ compiler and the basic dependencies needed for any kind of development. On most Linux distributions there is a metapackage that installs these; on Debian/Ubuntu it is called `build-essential`, on Fedora it is `@development-tools` and on Arch it is `base-devel`.
  +
  To build the wallet, run the following commands:
  $ ./autogen.sh
  