Remove deprecated GuildChannel::permissions_for_user (#3033) #993

Job	Run time
Test (nightly)	1m 32s
Build docs	27s
Test (macOS)	1m 20s
Check minimal versions	30s
MSRV	0s
Test (stable)	2m 29s
Test (beta)	2m 38s
Test (Windows)	4m 19s
Test (native-tls)	2m 17s
Examples	2m 18s
Test (no default features)	41s
Test (no cache)	2m 27s
Test (no gateway)	1m 33s
Test (unstable Discord API features)	2m 27s
Test (chrono, chrono)	39s
Test (unstable API + typesize, default unstable typesize, true)	44s
Test (builder without model, builder, true)	37s
Test (unstable Discord API (no default features), unstable, true)	25s
	27m 23s

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