updated appvoyer

Author: smasherprog

.appveyor.yml

@@ -14,14 +14,20 @@ install:
   - pip install autobahntestsuite
   - ps: If ($env:Platform -Match "x86"){ $env:CMAKE_ARCH="" } Else { $env:CMAKE_ARCH=" Win64"}
   - cd c:\projects
+  - set CMAKE_URL="https://cmake.org/files/v3.9/cmake-3.9.3-win64-x64.zip"
+  - appveyor DownloadFile %CMAKE_URL% -FileName cmake.zip
+  - 7z x cmake.zip -oC:\projects\cmake > nul
+  - move C:\projects\deps\cmake-* C:\projects\deps\cmake # Move to a version-agnostic directory
+  - set PATH=C:\projects\deps\cmake\bin;%PATH%
+  - cmake --version
   - mkdir build
   - cd build
   - git clone https://github.com/Microsoft/vcpkg
   - cd vcpkg
   - powershell -exec bypass scripts\bootstrap.ps1
   - .\vcpkg integrate install
   - .\vcpkg install zlib:x86-windows-static openssl:x86-windows-static zlib openssl
-
+  
 build_script:
   - cd c:\projects\proj
   - mkdir build