minor rebase issue

Author: mohdibntarek

Project.toml

@@ -25,7 +25,6 @@ ForwardDiff = "0.10.6"
 PDMats = "0.9"
 SpecialFunctions = "0.8, 0.9, 0.10"
 StatsFuns = "0.8, 0.9"
-SpecialFunctions = "0.8, 0.9"
 Tracker = "0.2.5"
 Zygote = "0.4.7"
 ZygoteRules = "0.2"