Update appveyor.yml

Author: dextorious

appveyor.yml

@@ -2,8 +2,8 @@ environment:
   matrix:
   - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x86/1.0/julia-1.0.5-win32.exe"
   - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/1.0/julia-1.0.5-win64.exe"
-  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x86/1.4/julia-1.4.0-win32.exe"
-  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/1.4/julia-1.4.0-win64.exe"
+  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/1.4/julia-1.4.2-win32.exe"
+  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/1.4/julia-1.4.2-win64.exe"
 
 branches:
   only: