Fix download link for ada.h in README.md (#1011)

Author: Fluder-Paradyne

README.md

@@ -69,7 +69,7 @@ Linux or macOS users might follow the following instructions if they have a rece
 1. Pull the library in a directory
    ```
    wget https://github.com/ada-url/ada/releases/download/v3.0.0/ada.cpp
-   wget https://github.com/ada-url/ada/releases/download/v3.0.00/ada.h
+   wget https://github.com/ada-url/ada/releases/download/v3.0.0/ada.h
    ```
 2. Create a new file named `demo.cpp` with this content:
    ```C++
@@ -351,4 +351,4 @@ Our tests include third-party code and data. The benchmarking code includes thir
 ## Stars
 
 
-[![Star History Chart](https://api.star-history.com/svg?repos=ada-url/ada&type=Date)](https://www.star-history.com/#ada-url/ada&Date)
+[![Star History Chart](https://api.star-history.com/svg?repos=ada-url/ada&type=Date)](https://www.star-history.com/#ada-url/ada&Date)