Fix lint errors

utils/read_current_data.go

@@ -4,6 +4,7 @@ import "io"
 
 const readCurrentDataBufferSize = 1024 + 1 // + 1 because telegram operates with blocks mod 4
 
+// ReadCurrentData reads all data from io.Reader which is ready to be read.
 func ReadCurrentData(src io.Reader) (rv []byte, err error) {
 	buf := make([]byte, readCurrentDataBufferSize)
 	n := readCurrentDataBufferSize