dump_shc.js: ensure full contents of SMART health card are displayed

Node.js "helpfully" tries to reduce the amount of output when we pass
the decoded object to console.log(), so we need to pretty-print it
ourselves before displaying.  Fixes #2.

dump_shc.js

@@ -37,7 +37,7 @@ verifyJWS(scannedJWS, header.kid).then(
   function (result) {
     return decodeJWSPayload(result.payload).then(
       (decoded) => {
-        console.log(decoded.vc.credentialSubject.fhirBundle.entry);
+        console.log(JSON.stringify(decoded.vc.credentialSubject.fhirBundle.entry, null, 2));
       },
       (e) => {
         console.log("Ooooh crap - this looks like a fake vaccination proof");