We don't want to overwrite req.pg that the dev may have set

Resolves #75

Author: Toni Sharpe

index.js

@@ -126,7 +126,7 @@ function fastifyPostgres (fastify, options, next) {
 
           req.pg[name] = client
         } else {
-          if (req.pg && req.pg.query) {
+          if (req.pg) {
             throw new Error('request client has already been registered')
           } else {
             req.pg = client