default.nix: flashdb requires wget (travisgoodspeed#886)

Author: hax404

default.nix

@@ -10,6 +10,7 @@ with import <nixpkgs> {}; {
       python27
       python27Packages.pyusb
       unzip
+      wget
       which
     ];
     LD_LIBRARY_PATH="${libusb1.out}/lib";