change Buffer('a') to Syumbol() to force TypeError

unsure if this is correct, but everything that is type 'object' will be handled by code as is.

Author: sjpotter

packages/graph/lib/commands/QUERY.spec.ts

@@ -32,7 +32,7 @@ describe('GRAPH.QUERY', () => {
         assert.throws(() => {
           QUERY.transformArguments('key', 'query', {
             params: {
-              a: Buffer.from('a')
+              a: Symbol()
             }
           })
         }, TypeError);