Added note about VOIP as per issue 1214 (#1286)
Added note about VOIP as per issue 1214 (#1286)

"VOIP services like Google Voice are not supported"
https://github.com/steemit/condenser/issues/1214
steemit/steemit.com,TimCliff/steemit.com,steemit/steemit.com,steemit/steemit.com,TimCliff/steemit.com,TimCliff/steemit.com