Remove dependency on miktex installation script (#6)

Author: aobolensk

appveyor.yml

@@ -4,7 +4,7 @@ environment:
       CMAKE_GENERATOR: "Visual Studio 16 2019"
 
 install:
-  - powershell -file "scripts\miktex_install.ps1"
+  - choco install miktex
   - refreshenv
   - pdflatex -version