Modify Makefile to fix issues with sed handling inputs.

[afinetooth]

⚡ Summary

• Modify Makefile to fix issues with sed handling inputs.
• Prior to changes, make new_version was throwing errors like this:

% make new_version
New version: 0.6.13
Brief description: Update Crystal lang version to 1.13.1
sed -i "s/version:.*/version: $version/" shard.yml
sed: 1: "shard.yml": unterminated substitute pattern
make: *** [new_version] Error 1

☑️ Checklist

• Modify Makefile 🤞

[coveralls-official]

Pull Request Test Coverage Report for Build 10361837899

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 94.087%

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Totals
Change from base Build 10361166725:	0.1%
Covered Lines:	907
Relevant Lines:	964

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💛 - Coveralls