Ignore io.EOF comparison for (*bufio.Reader).ReadLine (#12)

Although the documentation for (*bufio.Reader).ReadLine
do not mention io.EOF explicitly, this function can also
return it -- the implementation [1] user ReadSlice() which
is documented to return io.EOF.

[1] https://golang.org/src/bufio/bufio.go?s=10168:10235#L378

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

errorlint/allowed.go

@@ -17,6 +17,7 @@ var allowedErrors = []struct {
 	{err: "io.EOF", fun: "(*bufio.Reader).Read"},
 	{err: "io.EOF", fun: "(*bufio.Reader).ReadByte"},
 	{err: "io.EOF", fun: "(*bufio.Reader).ReadBytes"},
+	{err: "io.EOF", fun: "(*bufio.Reader).ReadLine"},
 	{err: "io.EOF", fun: "(*bufio.Reader).ReadSlice"},
 	{err: "io.EOF", fun: "(*bufio.Reader).ReadString"},
 	{err: "io.EOF", fun: "(*bufio.Scanner).Scan"},