Handle EOF in the comment lexing function

CHANGELOG.md

@@ -5,6 +5,7 @@
 * Carriage return characters now work correctly in multi-line strings,
   so files produced on Windows with CRLF newlines are parsed correctly
   (report by Bohdan Kolesnikov)
+* Files that consists of a single comment without a newline are handled correctly now.
 * Correct use of custom inequality functions in the example from the README (patch by Yawar Amin) 
 
 ## 1.0.4

src/lib/toml_lexer.mll

@@ -508,6 +508,7 @@ and read_comment state buf =
       in
       token state lexbuf
     }
+  | eof { token state lexbuf }
   | [^ '\n' '\x00'-'\x08' '\x0B'-'\x1F' '\x7F']+
     { Buffer.add_string buf (Lexing.lexeme lexbuf); read_comment state buf lexbuf }