message: Add TOOLCHAIN var to examples README
  To run the `run_examples.sh` script standalone, you must provide
  this variable.
diff: @@ -5,4 +5,8 @@ the state of the shell as it is developed. When the **run_examples.sh** script
  is executed, it will build Ion and execute each of the ion scripts here, and
  compare their outputs to their assoicated **out** files.
  +```
  +TOOLCHAIN=stable ./run_examples.sh
  +```
  +
  For more elaborate examples of Ion usage, check out the **advanced** directory.
  