temp: Remove appveyor build for Python 3

These changes are meant to be merge in
#158

Author: embs

.appveyor.yml

@@ -5,22 +5,6 @@ environment:
     PYTHON: 'C:\Python27\python.exe'
   - GENERATOR: 'Visual Studio 10 Win64'
     PYTHON: 'C:\Python27-x64\python.exe'
-  - GENERATOR: 'Visual Studio 10'
-    PYTHON: 'C:\Python33\python.exe'
-  - GENERATOR: 'Visual Studio 10 Win64'
-    PYTHON: 'C:\Python33-x64\python.exe'
-  - GENERATOR: 'Visual Studio 10'
-    PYTHON: 'C:\Python34\python.exe'
-  - GENERATOR: 'Visual Studio 10 Win64'
-    PYTHON: 'C:\Python34-x64\python.exe'
-  - GENERATOR: 'Visual Studio 14'
-    PYTHON: 'C:\Python35\python.exe'
-  - GENERATOR: 'Visual Studio 14 Win64'
-    PYTHON: 'C:\Python35-x64\python.exe'
-  - GENERATOR: 'Visual Studio 14'
-    PYTHON: 'C:\Python36\python.exe'
-  - GENERATOR: 'Visual Studio 14 Win64'
-    PYTHON: 'C:\Python36-x64\python.exe'
 
 init:
   - cmd: '%PYTHON% -m pip install -U nose wheel pygit2==0.26.1'