Update .cirrus.yml

Author: oxinabox

.cirrus.yml

@@ -14,6 +14,7 @@ task:
     - cirrusjl build
   test_script:
     - git clone "https://github.com/JuliaDiff/ChainRules.jl.git"
+    # This is a special integration test to see if we broke ChainRules.jl with latest ChainRulesCore.jl changes 
     # Start julia with  the project set to newly cloned subdir ChainRules.jl
     # dev the current directory to get the version of ChainRulesCore that we are testing
     # update everything to resolve and sortout any versions,