Drop support for Windows + Python3

This fixes appveyor build.

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'

README.md

@@ -82,6 +82,12 @@ brew update
 brew install gitless
 ```
 
+### Windows Compatibility
+
+For now, Windows support is unavailable for Python3+ due to pbs dependency
+(which is not Python3 compatible). Checkout
+[#146](https://github.com/sdg-mit/gitless/issues/146) for more info.
+
 Documentation
 -------------