add High Sierra 10.13.6 to versions built and tested on

g0orx · Aug 21, 2018 · 4d448b1 · 4d448b1
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 ### Development environment
 
-Development and testing has been run on MacOS Sierra 10.12.6. Prerequisites are installed using [Homebrew](https://brew.sh/).
+Development and testing has been run on MacOS Sierra 10.12.6 and MacOS high Sierra 10.13.6. Prerequisites are installed using [Homebrew](https://brew.sh/).
 
 ### Prerequisites for building