Fix "With Progress Callback" code example
@ -662,7 +662,7 @@ auto res = cli.Post(
### With Progress Callback
```cpp
httplib::Client client(url, port);
httplib::Client cli(url, port);
// prints: 0 / 000 bytes => 50% complete
auto res = cli.Get("/", [](uint64_t len, uint64_t total) {
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