feat(tokio): update version to 1.0

[kurnevsky]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 491523898

• 48 of 57 (84.21%) changed or added relevant lines in 11 files are covered.
• 11 unchanged lines in 6 files lost coverage.
• Overall coverage increased (+0.3%) to 95.028%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tox_core/src/relay/server/server_ext.rs	20	21	95.24%
tox_core/src/dht/lan_discovery.rs	0	2	0.0%
tox_core/src/net_crypto/mod.rs	1	3	33.33%
tox_core/src/onion/client/mod.rs	1	3	33.33%
tox_core/src/relay/client/connections.rs	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
tox_core/src/dht/server/mod.rs	1	94.65%
tox_core/src/friend_connection/mod.rs	1	97.85%
tox_core/src/onion/client/nodes_pool.rs	1	88.75%
tox_core/src/net_crypto/mod.rs	2	97.62%
tox_core/src/relay/client/connections.rs	2	95.62%
tox_core/src/onion/client/mod.rs	4	95.7%

Totals
Change from base Build 447511900:	0.3%
Covered Lines:	16015
Relevant Lines:	16853

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💛 - Coveralls