Upstream issue: aadsm/jschardet#48

• VSCode Version: Version 1.15.1
• OS Version: Windows 10.0.15063

Steps to Reproduce:

1. The settings.json of my vscode

    "files.encoding": "utf8",
    "files.autoGuessEncoding": true,

2. Ceate two txt files, make sure the files are saved as utf-8

test1.txt

Created on: 2017年9月2日
测

test2.txt

Created on: 2017年9月2日
测试

3. Reopen the files,test1.txt guessed encoding is Windows 1252 and test2.txt guessed encoding is utf-8.

Reproduces without extensions: Yes