Remove the --inline-fonts switch, always keep the fonts inline when only one format is requested

[papandreou]

Fixes #10.

As suggested in https://github.com/Munter/subfont/issues/10#issuecomment-668000031

• [x] Consider also making it a prerequisite that the given font is used on every page.

[coveralls]

Pull Request Test Coverage Report for Build 579

• 42 of 43 (97.67%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 90.037%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/parseCommandLineOptions.js	1	2	50.0%
<!--	Total:	42	43	97.67%	-->

Totals
Change from base Build 560:	-0.03%
Covered Lines:	1153
Relevant Lines:	1229

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💛 - Coveralls

[papandreou]

Landed in a85fc9cbb6caf4bd52c96eb1b5255e1eb43256be, released in 6.0.0