Update version

Author: AlexRobson

Project.toml

@@ -1,7 +1,7 @@
 name = "PDMatsExtras"
 uuid = "2c7acb1b-7338-470f-b38f-951d2bcb9193"
 authors = ["Invenia Technical Computing"]
-version = "2.2.0"
+version = "2.2.1"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
@@ -10,10 +10,7 @@ PDMats = "90014a1f-27ba-587c-ab20-58faa44d9150"
 
 [compat]
 ChainRulesCore = "0.9.17"
-Distributions = "0.23, 0.24"
-FiniteDifferences = "0.11"
 PDMats = "0.9, 0.10"
-Zygote = "0.5.5"
 julia = "1"
 
 [extras]