Update appveyor.yml

Author: SlavaRa

appveyor.yml

@@ -1,4 +1,4 @@
-os: Visual Studio 2015
+os: Visual Studio 2017
 environment:
   ID: postfixcodecompletion
   PLUGIN_VERSION: 1.0
@@ -14,7 +14,7 @@ environment:
   FD_EXECUTABLE_DIR: FlashDevelop\Bin\Debug
   FD_SETTINGS: C:\Users\appveyor\AppData\Local\FlashDevelop
 install:
-- set PATH=C:\Program Files (x86)\MSBuild\14.0\Bin;%PATH%
+- set PATH=С:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin;%PATH%
 version: $(PLUGIN_VERSION).{build}
 skip_tags: true
 init: