Wrong guess encoding as Windows 1252

[Yanpas]

See https://github.com/Microsoft/vscode/issues/33720

Test case

#!/bin/sh

foo() {
	echo "starting …"
}

Ellipsis symbol … makes vscode guess cp1252. UTF8 should have higher priority IMO

[Yanpas]

See https://github.com/Microsoft/vscode/issues/33720#issuecomment-398412202

[lingsamuel]

I built vscode-oss with jschardet 2.2.1 and test this case, vscode guess the file as UTF-8 correctly. I think patch #57 and #59 already fixed this issue. @aadsm maybe this issue can be closed?