Update appveyor.yml

Fix "cd" into build directory

appveyor.yml

@@ -13,9 +13,9 @@ install:
   - "%PYTHON%\\python.exe -m pip install wheel"
 
   # Installing spectrum/overload now
-  - cmd: "%APPVEYOR_BUILD_FOLDER%"
-  - "%PYTHON%\\python.exe -m pip install -r requirements.txt"
-  - "%PYTHON%\\python.exe setup.py install"
+  - cmd: "cd %APPVEYOR_BUILD_FOLDER%"
+  - cmd: "%PYTHON%\\python.exe -m pip install -r requirements.txt"
+  - cmd: "%PYTHON%\\python.exe setup.py install"
 
 build: off
 
@@ -29,7 +29,7 @@ after_test:
   # Again, you only need build.cmd if you're building C extensions for
   # 64-bit Python 3.3/3.4. And you need to use %PYTHON% to get the correct
   # interpreter
-  - "%PYTHON%\\python.exe setup.py bdist_wheel"
+  - cmd: "%PYTHON%\\python.exe setup.py bdist_wheel"
 
 artifacts:
   # bdist_wheel puts your built wheel in the dist directory