drop old versions

Author: mcabbott

Project.toml

@@ -11,11 +11,11 @@ Tracker = "9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c"
 ZygoteRules = "700de1a5-db45-46bc-99cf-38207098b444"
 
 [compat]
-ForwardDiff = "0.8, 0.9, 0.10"
+ForwardDiff = "0.10"
 JuliennedArrays = "0.3"
-StaticArrays = "0.10, 0.11, 0.12, 1.0"
+StaticArrays = "1.0"
 Tracker = "0.2"
-Zygote = "0.4, 0.5, 0.6"
+Zygote = "0.6"
 ZygoteRules = "0.2"
 julia = "1.3"