Update AppVeyor configuration

README.md

@@ -43,7 +43,7 @@ Quasar is a fast and light-weight remote administration tool coded in C#. Provid
   * Windows 10
 
 ## Compiling
-Open the project in Visual Studio 2015+ and click build. See below which build configuration to choose.
+Open the project in Visual Studio 2017+ and click build. See below which build configuration to choose.
 
 ## Building a client
 | Build configuration         | Usage scenario | Description

appveyor.yml

@@ -1,15 +1,20 @@
 version: BUILD{build}
-skip_tags: true
+
+image: Visual Studio 2017
+shallow_clone: true
+
 configuration:
 - Debug
 - Release
-shallow_clone: true
+
 before_build:
   - nuget restore
+
 build:
   project: QuasarRAT.sln
   parallel: true
   verbosity: minimal
+
 artifacts:
 - path: Bin
   name: binaries