message: added supported operating systems to readme.md
diff: @@ -12,6 +12,12 @@ developing applications (smart contracts).
  The public testnet described in the [wiki](https://github.com/EOSIO/eos/wiki/Testnet%3A%20Public) is running the `dawn-2.x` branch. The `master` branch is no longer compatible with the public testnet. Instructions are provided below for building either option.
  +### Supported Operating Systems
  +EOS.IO currently supports the following operating systems:
  +1. Ubuntu 16.04 and higher (Ubuntu 16.10 recommended).
  +2. MacOS Darwin 10.12 and higher (MacOS 10.13.x recommended).
  +3. Fedora 25 and higher (Fedora 27 recommended).
  +
  # Resources
  1. [EOS.IO Website](https://eos.io)
  2. [Documentation](https://eosio.github.io/eos/)
  @@ -81,7 +87,7 @@ Choose whether you will be building for a local testnet or for the public testne
  We strongly recommend following the instructions for building the public testnet version for [Ubuntu](#autoubuntupublic) or [Mac OS X](#automacpublic). `master` is in pieces on the garage floor while we rebuild this hotrod. This notice will be removed when `master` is usable again. Your patience is appreciated.
  <a name="autoubuntulocal"></a>
  -#### Clean install Linux (Ubuntu & Fedora) for a local testnet :no_entry:
  +#### Clean install Linux (Ubuntu & Fedora) for a local testnet
  ```bash
  git clone https://github.com/eosio/eos --recursive
  @@ -106,7 +112,7 @@ git checkout dawn-2.x
  Now you can proceed to the next step - [Running a node on the public testnet](#publictestnet)
  <a name="automaclocal"></a>
  -#### MacOS for a local testnet :no_entry:
  +#### MacOS for a local testnet
  Before running the script make sure you have installed/updated XCode. Note: The build script
  will install homebrew if it is not already installed on you system. [Homebrew Website](https://brew.sh)
  @@ -758,11 +764,11 @@ cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=.. -DLLVM_TARGETS_TO_BUILD= -DL
  make -j$( nproc ) install
  ```
  -Your environment is set up. Now you can <a href="#runanode">build EOS and run a node</a>.
  -
  Add `WASM_LLVM_CONFIG` and `LLVM_DIR` to your `.bash_profile`:
  ```bash
  echo "export WASM_LLVM_CONFIG=~/wasm-compiler/llvm/bin/llvm-config" >> ~/.bash_profile
  echo "export LLVM_DIR=/usr/local/Cellar/llvm/4.0.1/lib/cmake/llvm" >> ~/.bash_profile
  source ~/.bash_profile
  +
  +Your environment is set up. Now you can <a href="#runanode">build EOS and run a node</a>.
  