Remove unnecessary ed25519-dalek dependency from v1_public feature #310

Job	Run time
Default Features (batteries_included + v4)	1m 21s
Test Suite (v1_local)	1m 0s
Security Audit	2m 44s
Clippy (v4_public)	30s
Clippy (v3_local)	36s
Test Suite (v2_public)	59s
Test Suite (v3_local)	1m 11s
Clippy (v1_local)	38s
Test Suite (v4_local)	1m 3s
Clippy (v4_local)	32s
Test Suite (v1_public)	53s
Clippy (v2_public)	31s
Clippy (v3_public)	22s
Clippy (v1_public)	41s
Test Suite (v2_local)	1m 1s
Clippy (v2_local)	48s
Test Suite (v4_public)	56s
Test Suite (v3_public)	58s
	16m 44s

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