Update module jhillyerd/enmime to v0.8.3

This MR contains the following updates:

Package	Type	Update	Change
github.com/jhillyerd/enmime	require	patch	v0.8.2 -> v0.8.3

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Release Notes

jhillyerd/enmime

v0.8.3

Compare Source

Fixed

• Reverted folded header parsing changes due to compatibility problems (#​172)
• Improved performance and memory consumption of boundary reader (#​170, thanks bttrfl and dcormier)

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go.mod

 module git.autistici.org/ai3/tools/reports-collector
 
+go 1.15
+
 require (
 	github.com/chrj/smtpd v0.1.2
-	github.com/jhillyerd/enmime v0.8.2
+	github.com/jhillyerd/enmime v0.8.3
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/oschwald/geoip2-golang v1.4.0
 	github.com/prometheus/client_golang v1.8.0