fix(error)!: Clarify convert_error is meant to be used with streams

[epage]

This is part of #261

[coveralls]

Pull Request Test Coverage Report for Build 5383561382

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.06%) to 50.509%

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Files with Coverage Reduction	New Missed Lines	%
src/error.rs	2	33.33%

Totals
Change from base Build 5382625143:	0.06%
Covered Lines:	1241
Relevant Lines:	2457

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💛 - Coveralls