Remove python version

.travis.yml

@@ -1,7 +1,6 @@
 language: python
 dist: trusty
 sudo: false
-python: 2.7
 
 services:
   - docker

CONTRIBUTING.cn.md

@@ -0,0 +1,40 @@
+<!-- Copyright (c) 2016-2020 Wang Shidong & Contributors -->
+<!-- Author: Wang Shidong < wsdjeg at 163.com > -->
+<!-- URL: https://spacevim.org -->
+<!-- License: GPLv3 -->
+
+## 贡献代码
+
+SpaceVim 这一项目的存在，得益于所有参与贡献的朋友，我们非常感谢来自于社区的贡献。
+为了能够更好的维护 SpaceVim，我们制定了如下规则，要求所有参与的开发者共同遵守。
+
+### 贡献代码
+
+我们非常欢迎开发者贡献代码，请仔细阅读以下内容。同时也可以加入我们的[中文聊天室](https://gitter.im/SpaceVim/cn)，
+沟通交流。
+
+
+#### License
+
+The license is GPLv3 for all the parts of SpaceVim. this includes:
+
+- The initialization and core files.
+- All the layer files.
+- The documentation
+
+For files not belonging to SpaceVim, such as local packages and libraries, refer to the header file.
+Those files should not have an empty header. We may not accept code without a proper header file.
+
+#### Conventions
+
+SpaceVim is based on conventions, mainly for naming functions, keybindings definition and writing
+documentation. Please read the [conventions](https://spacevim.org/conventions/) before your first contribution to get to know them.
+
+#### Pull Request
+
+Submit your contribution against the `master` branch. You should not use your master branch
+to modify SpaceVim, this branch is considered to be read-only.
+
+You may want to read our [development guidelines](https://spacevim.org/development/).
+
+