docs: Add 'cygwin' to reference table for .system()

This aligns this table with the set of values tested for by test case common/140
2017-11-17 12:58:05 +00:00 · 2017-11-17 12:58:05 +00:00 · 34d1d45094
parent c653936700
commit 34d1d45094
1 changed files with 1 additions and 0 deletions
--- a/docs/markdown/Reference-tables.md
+++ b/docs/markdown/Reference-tables.md
@ -55,6 +55,7 @@ These are provided by the `.system()` method call.
 | linux               | |
 | darwin              | Either OSX or iOS |
 | windows             | Any version of Windows |
+| cygwin              | The Cygwin environment for Windows |

 Any string not listed above is not guaranteed to remain stable in
 future releases.