Typo and path highlight bug

[jwaton]

Two very small fixes:

• One typo fix in the README.md file of the word 'complementary'
• One conditional execution in stability selection plot; in the case where all paths were highlighted, this code would error on line 139 (plotting non-highlighted paths). There is an argument for saying then the regularisation parameter search range is not appropriate, but we can avoid the error by adding an if statement.

[coveralls]

Pull Request Test Coverage Report for Build 76

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.007%) to 97.368%

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Totals
Change from base Build 75:	0.007%
Covered Lines:	370
Relevant Lines:	380

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💛 - Coveralls

[thuijskens]

Good catch! Thanks very much for the contribution, and apologies for only looking at this now!