upgrade 0.2.2

A helpful library for upgradeing the self program. Welcome to submit PR.
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# Upgrade


[![Crate](https://img.shields.io/crates/v/upgrade.svg)](https://crates.io/crates/upgrade)
[![GitHub last commit](https://img.shields.io/github/last-commit/xuxiaocheng0201/upgrade)](https://github.com/xuxiaocheng0201/upgrade/commits/master)
[![GitHub issues](https://img.shields.io/github/issues-raw/xuxiaocheng0201/upgrade)](https://github.com/xuxiaocheng0201/upgrade/issues)
[![GitHub pull requests](https://img.shields.io/github/issues-pr/xuxiaocheng0201/upgrade)](https://github.com/xuxiaocheng0201/upgrade/pulls)
[![GitHub](https://img.shields.io/github/license/xuxiaocheng0201/upgrade)](https://github.com/xuxiaocheng0201/upgrade/blob/master/LICENSE)

**Read this in other languages: [English](README.md), [简体中文](README_zh.md).**

**Welcome to submit [PR](https://github.com/xuxiaocheng0201/variable-len-reader/pulls)!**

# Description


A Rust crate to upgrade your program easily.


# Usage


Add this to your `Cargo.toml`:

```toml
[dependencies]
upgrade = "~0.2"
```


# Example


Using the Builder mode:

```rust
use upgrade::builder::Builder;

fn main() {
     Builder::create().unwrap()
         .source(&"./upgrade.exe")
         .upgrade().unwrap();
}
```

A shortcut:

```rust
use upgrade::upgrade;

fn main() {
    upgrade("./upgrade.exe").unwrap();
}
```