Patch Electrum v3.1.3 to fix remote networking thread crash vulnerability

patch-electrum-3.1.3.diff

559,564c559,568
<             if error is None and result > 0:
<                 i = params[0]
<                 fee = int(result*COIN)
<                 self.config.update_fee_estimates(i, fee)
<                 self.print_error("fee_estimates[%d]" % i, fee)
<                 self.notify('fee')
---
>             try:
>                 if error is None and result > 0:
>                     i = params[0]
>                     fee = int(result*COIN)
>                     self.config.update_fee_estimates(i, fee)
>                     self.print_error("fee_estimates[%d]" % i, fee)
>                     self.notify('fee')
>             except:
>                 self.print_error("ignoring estimatefee exception")
>