fix dead "Exception system proposal" link

Replaced with web archive of the proposal doc. The original link is giving me a 404
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Caleb Allen 2019-07-24 15:00:22 -06:00 committed by Matthew Flatt
parent 57f64367ed
commit 2e26e99a60

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@ -129,7 +129,7 @@ The @racketmodname[racket] library combines
#:title "Exception system proposal"
#:author "Daniel P. Friedman, C. T. Haynes, and R. Kent Dybvig"
#:location "web page"
#:url "http://www.cs.indiana.edu/scheme-repository/doc.proposals.exceptions.html"
#:url "https://web.archive.org/web/20161012054505/http://www.cs.indiana.edu/scheme-repository/doc.proposals.exceptions.html"
#:date "1995")
(bib-entry #:key "Gasbichler02"