Fix Nim dependency (nim-lang#16)

ZoomRmc · web-flow · commit 49562fa0d393 · 2022-03-30T15:15:44.000+02:00
`extract` for `Isolated` absent for nim&lt;1.4.6
diff --git a/threading.nimble b/threading.nimble
@@ -7,4 +7,4 @@ license       = "MIT"
 
 # Dependencies
 
-requires "nim >= 1.4"
+requires "nim >= 1.4.6"
