Fixed typo in internal.rs

[cod10129]

impl Finish for IResult Err::Incomplete panic message had a double-space, which was removed.

[Geal]

thanks!

[coveralls]

Pull Request Test Coverage Report for Build 6714061557

Warning: This coverage report may be inaccurate.

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A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 62.376%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/internal.rs	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/character/complete.rs	1	84.4%

Totals
Change from base Build 6598431626:	-0.03%
Covered Lines:	1827
Relevant Lines:	2929

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💛 - Coveralls