v1.8.0 to fix multiple-definitions linker error

### Releases v1.8.0

1. Fix `multiple-definitions` linker error and weird bug related to `src_cpp`. Check [Different behaviour using the src_cpp or src_h lib #80](khoih-prog/ESPAsync_WiFiManager#80)
2. Optimize library code by using `reference-passing` instead of `value-passing`

README.md

@@ -4511,7 +4511,7 @@ Submit issues to: [ESP_WiFiManager issues](https://github.com/khoih-prog/ESP_WiF
 15. Thanks to [energise](https://github.com/energise) to report the issue in [Invalid Json generated #60](https://github.com/khoih-prog/ESP_WiFiManager/issues/60) leading to new v1.7.1
 16. Thanks to [eth0up](https://github.com/eth0up) to make the PR [Add support for Wifi hidden SSID scanning. #66](https://github.com/khoih-prog/ESP_WiFiManager/pull/66) leading to v1.7.4
 17. Thanks to [Dean Ott](https://github.com/deanjott) for reporting [WiFiManager works only on port 80 #75](https://github.com/khoih-prog/ESPAsync_WiFiManager/issues/75) and providing the solution leading to v1.7.8
-18. Thanks to [Twaste](https://github.com/Twaste) for initiate the discussion in [Different behaviour using the src_cpp or src_h lib #80](https://github.com/khoih-prog/ESPAsync_WiFiManager/discussions/80) and providing the idea to the solution, to fix `multiple-definitions` linker error, leading to v1.8.0
+18. Thanks to [Twaste](https://github.com/Twaste) for initiating the discussion in [Different behaviour using the src_cpp or src_h lib #80](https://github.com/khoih-prog/ESPAsync_WiFiManager/discussions/80) and providing the idea to the solution, to fix `multiple-definitions` linker error, leading to v1.8.0
 
 
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