Update appveyor.yml

Author: BenLauwens

appveyor.yml

@@ -6,7 +6,6 @@ environment:
 install:
   - ps: "[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12"
 # Download most recent Julia Windows binary
-  - ps: "[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12"
   - ps: (new-object net.webclient).DownloadFile(
         $env:JULIA_URL,
         "C:\projects\julia-binary.exe")