Update module jhillyerd/enmime to v0.8.4

This MR contains the following updates:

Package	Type	Update	Change
github.com/jhillyerd/enmime	require	patch	v0.8.3 -> v0.8.4

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Release Notes

jhillyerd/enmime

v0.8.4

Compare Source

Fixed

• Attachment file names containing semicolons are no longer truncated (#​174)

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go.mod

@@ -4,7 +4,7 @@ go 1.15
 
 require (
 	github.com/chrj/smtpd v0.2.0
-	github.com/jhillyerd/enmime v0.8.3
+	github.com/jhillyerd/enmime v0.8.4
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/oschwald/geoip2-golang v1.4.0
 	github.com/prometheus/client_golang v1.9.0