[Wex] Update resource file
[Wex] Update resource file

  - Updating min-amount

They have three scales: 0.1, 0.01, 0.001
For each base currency the min is always the same, for example:
BTC,BTH are always 0.001,
ETH, ZEC. LTC are always 0.01,
NMC, NVC are 0.1

douggie/XChange