Update appveyor configuration

.appveyor.yml

@@ -19,6 +19,7 @@ install:
 
 
   # Installing Poetry
   # Installing Poetry
   - "python get-poetry.py --preview -y"
   - "python get-poetry.py --preview -y"
+  - "SET PATH=%USERPROFILE%\\.poetry\\bin;%PATH%"
 
 
   # Install dependencies
   # Install dependencies
   - "poetry install -v"
   - "poetry install -v"