使用git提交代码在本次提交时已有其他人提交过代码，报如下信息：
Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
话不多说，直接描述方法：
- 键盘输入‘i’
- 键盘输入‘esc’
- 键盘输入‘:wq’
- 键盘输入‘enter’，提交代码成功
