Removing try/catch in sheldon_suggestions_server: suggestions/2

[ferigis]

in this code

suggestions(MisspelledWords, Lang) ->
  try rpc:pmap({?MODULE, add_suggestions}, [Lang], MisspelledWords) of
    Result -> Result
  catch
    exit:badrpc:Stacktrace ->
      error_logger:error_msg( "~p:~p >> Error: badrpc~n\tStack: ~p"
                            , [?MODULE, ?LINE, Stacktrace]
                            ),
      MisspelledWords
  end.

we can remove the catch since the rpc:pmap/3 doesn't throw an exception

[ferigis]

After that change we can test with Erlang 19 and 20 since that was the only use of Erlang 21 syntax