Update ipc-channel requirement from 0.15 to 0.16

[dependabot[bot]]

Updates the requirements on ipc-channel to permit the latest version.

Commits

• 6c1789f Publish 0.16.0.
• f6b3d8f Auto merge of #288 - negator:patch-2, r=jdm
• 5582ad5 FusedStream for IpcStream
• f700ea3 Auto merge of #287 - negator:patch-1, r=jdm
• 80a249f Update Cargo.toml
• 73514f5 Update Cargo.toml
• 2316b71 Update futures
• 589a62c Auto merge of #279 - ferivoz:typos, r=jdm
• a7e5534 Auto merge of #278 - ferivoz:null, r=jdm
• fbb4065 Auto merge of #286 - servo:github-actions, r=jdm
• Additional commits viewable in compare view

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