bump Zygote compat version

mohamed82008 · mohamed82008 · commit c899e16269bb · 2020-01-29T23:11:19.000+11:00
diff --git a/Project.toml b/Project.toml
@@ -22,7 +22,7 @@ ForwardDiff = "0.10.6"
 PDMats = "0.9"
 StatsFuns = "0.8, 0.9"
 Tracker = "0.2.5"
-Zygote = "0.4.1"
+Zygote = "0.4.7"
 julia = "1"
 
 [extras]
