Merge pull request #7 from JSainsburyPLC/fix-nr-txn

Only close NR transaction at the end of the request so error codes an…

context.go

@@ -69,6 +69,7 @@ func ContextMiddleware(
 			)
 
 			cc := NewContext(c, newRelicApp, logger, correlationID, isDebug, buildVersion)
+			defer cc.NewRelicTx.End()
 
 			return h(cc)
 		}
@@ -88,7 +89,6 @@ func NewContext(
 		echoCtx.Response().Writer,
 		echoCtx.Request(),
 	)
-	defer func() { _ = newRelicTx.End() }()
 	// new relic tx wraps response writer
 	echoCtx.Response().Writer = newRelicTx