Failing to parse QEMU memory dump note .shstrtab

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Hi,
if you generate an ELF core file containing the memory dump of VM in QEMU (```qemu-system-x86_64``` than in console ```dump-guest-memory FILENAME```) and you parse it with a simple Rust program as
```
use goblin::Object;
use std::io::Read;
use std::fs::File;

fn main() {

let mut file = File::open("/tmp/elf").map_err(|_| "open file error").expect("Error");

let mut head = vec![0; 1024*1024*2];
file.read(&mut head).ok();
println!("{:?}\n", Object::parse(&head));
}
```

you get ```Err(Malformed("Section 1 size (151127112) + offset (11) is out of bounds. Overflowed: false"))``` but the ELF core is correctly formatted. I suppose the error is a offset-by-one error.

Reproduce the failure with a QEMU-generated ELF core from the `dump-guest-memory FILENAME` command, then start at Rust's `goblin::Object::parse` handling of the ELF `.shstrtab` section. Compare the reported section size and offset with the valid dump; done means the correctly formatted core parses without the malformed-section error.

Written by the indexing model from the issue text.