Add workspace symbol support

Author: gatesn

appveyor.yml

@@ -15,7 +15,7 @@ init:
   - "ECHO %PYTHON% %PYTHON_VERSION% %PYTHON_ARCH%"
 
 install:
-  - "curl -vfsS -o ctags.zip https://github.com/universal-ctags/ctags-win32/releases/download/2018-03-13%2F5010e849/ctags-2018-03-13_5010e849-x64.zip"
+  - 'appveyor DownloadFile https://github.com/universal-ctags/ctags-win32/releases/download/2018-03-13%2F5010e849/ctags-2018-03-13_5010e849-x64.zip -FileName ctags.zip'
   - "7z e ctags.zip -o C:\\Users\\appveyor\\bin ctags.exe"
   - "set PATH=%PATH%;C:\\Users\\appveyor\\bin"
   - "%PYTHON%/python.exe -m pip install --upgrade pip setuptools"