http://www.cshtml5.com/links/what-is-supported.aspx
it is saying that supported
StreamReader: Dispose, EndOfStream, ReadLine, ReadToEnd
but compiler is throwing an error 
Severity	Code	Description	Project	File	Line	Suppression State
Error		The method "TextReader.ReadLine" is not yet supported. You can see the list of supported methods at: http://www.cshtml5.com/links/what-is-supported.aspx  - Please vote for this method at http://cshtml5.uservoice.com, or request it by posting on the forums at http://forums.cshtml5.com or by sending an email to support@cshtml5.com 
Please advise. 
P.S.  New Beta 8.2 released! Previous version is no different