Update github.com/lunixbochs/struc commit hash to 784aaeb

This MR contains the following updates:

Package	Type	Update	Change
github.com/lunixbochs/struc	require	digest	a5c7298 -> 784aaeb

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go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/emersion/go-textwrapper v0.0.0-20160606182133-d0e65e56babe
 	github.com/google/go-cmp v0.4.0
 	github.com/gorilla/handlers v1.4.2
-	github.com/lunixbochs/struc v0.0.0-20190916212049-a5c72983bc42
+	github.com/lunixbochs/struc 784aaebc1d40
 	github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75
 	github.com/openzipkin/zipkin-go v0.2.2
 	github.com/prometheus/client_golang v1.5.1