Add the period after contributors

Fix the break since https://github.com/citation-style-language/styles/commit/7f34dc546bee8024653f758b712c7f7ef76983b8 

https://github.com/citation-style-language/styles/commit/7f34dc546bee8024653f758b712c7f7ef76983b8  breaks the McGill-fr.csl
According to the McGill style, Name should not have periods but should end by a period in bibliography (and a comma in notes).