remove EnzymeCore dependency

Author: CarloLucibello

Project.toml

@@ -1,11 +1,10 @@
 name = "Optimisers"
 uuid = "3bd65402-5787-11e9-1adc-39752487f4e2"
-version = "0.4.1"
+version = "0.4.2"
 authors = ["Mike J Innes <[email protected]>"]
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
-EnzymeCore = "f151be2c-9106-41f4-ab19-57ee4f262869"
 Functors = "d9f16b24-f501-4c13-a1f2-28368ffc5196"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"