Encoding option only used for `text/html` mime type (needed UTF-8 for .txt file extension)

[zachleat]

eleventy-dev-server/server.js

Lines 434 to 455 in 1c65860

	getFileContentType(filepath, res) {
	let contentType = res.getHeader("Content-Type");
	// Content-Type might be already set via middleware
	if (contentType) {
	return contentType;
	}
	let mimeType = mime.getType(filepath);
	if (!mimeType) {
	return;
	}
	contentType = mimeType;
	// We only want to append charset if the header is not already set
	if (contentType === "text/html") {
	contentType = `text/html; charset=${this.options.encoding}`;
	}
	return contentType;
	}

https://hachyderm.io/@TheRealNooshu/114514184401582133

Reported by @Nooshu

[Krinkle]

Also:

• CSS (text/css)
• JS (text/javascript, application/javascript)
• JSON (application/json)
• XML (eg RSS)
• SVG
• anything else that's "text/"

I haven't checked the underlying lib, but I suspect the second condition here is redundant because the only way charset can be set is if the header is set (first condition). Afaik it's never part of a mine type.

[zachleat]

Fixed by #112