racket/HISTORY.txt: update for v7.5

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Matthew Flatt 2019-11-07 10:14:37 -07:00
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Version 7.5, November 2019
Bug repairs and other changes noted in the documentation
Version 7.4, July 2019
Disabled single-flonum reading by default and added
`read-single-flonum` and `single-flonum-available?`