insertTextBeforeRange(range, text) {
		return insertTextAt(range[0], text);
	}
Creates a fix command that inserts text before the specified range in the source text.
The fix is not applied until applyFixes() is called.
@param {SourceRange} range The range to replace, first item is start of range, second
     is end of range.
@param {string} text The text to insert.
@returns {Object} The fix command.