use a precise julia compat entry

0dba1958 · Miroslav Kratochvil · 523c6eb0 · 0dba1958
Commit 0dba1958 authored Dec 01, 2021 by Miroslav Kratochvil
--- a/Project.toml
+++ b/Project.toml
@@ -34,7 +34,7 @@ OrderedCollections = "1.4"
 SBML = "0.7, 0.8"
 StableRNGs = "1.0"
 Tulip = "0.7"
-julia = "1"
+julia = "1.5, 1.6, 1.7"

 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"