Fix Seek distances to work with sample data file

The text in reading-files.sh suggests creating a 9-byte file, and the current
Seek distances error out.

Fixes #564

Author: eliben

examples/reading-files/reading-files.go

@@ -53,11 +53,11 @@ func main() {
 
 	// Other methods of seeking are relative to the
 	// current cursor position,
-	_, err = f.Seek(4, io.SeekCurrent)
+	_, err = f.Seek(2, io.SeekCurrent)
 	check(err)
 
 	// and relative to the end of the file.
-	_, err = f.Seek(-10, io.SeekEnd)
+	_, err = f.Seek(-4, io.SeekEnd)
 	check(err)
 
 	// The `io` package provides some functions that may

examples/reading-files/reading-files.hash

@@ -1,2 +1,2 @@
-754d3ce4873b6f8f1c81364bfcf5fedb17020c11
-upAKv1DPNMp
+db59474ee414017c3021706ceb35d5e355f967b3
+SKTzfpnV0To