[TUHS] [tuhs] New version of a paper on Unix evolution

[Nelson H. F. Beebe]

A new journal issue published today carries this paper:

	Diomidis Spinellis and Paris Avgeriou
	Evolution of the Unix System Architecture: An Exploratory Case Study
	IEEE Transactions on Software Engineering 47(6) 1134--1163 June 2021
	https://doi.org/10.1109/TSE.2019.2892149

A preprint is available here:

	https://www.researchgate.net/publication/332826685_Evolution_of_the_Unix_System_Architecture_An_Exploratory_Case_Study

However, it is dated four years ago, and after removing its cover
page, diffpdf shows numerous changes compared to today's publication.

In the new version, a footnote on the first page says

	Manuscript received 19 May 2018; revised 18 Dec. 2018;
	accepted 28 Dec. 2018. Date of publication 2 May 2019; 
	date of current version 14 June 2021.

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