change projectId variable name to APIKey in Infura provider

[reza-sadeghzadeh]

I was in the middle of testing my project when I kept getting a 401 Unauthorized error. I couldn't figure out what was causing this error until I realized that I had been providing the wrong credentials for the Infura provider.
After checking out the documentation, I found out that one of the property names had been changed to something else. According to the documentation, "The API key was previously called the project ID" As soon as I corrected this mistake, the 401 Unauthorized error disappeared, and I was able to resume testing my project without any issues. Link to the Infura page

This PR involves modifying the name of a variable in the codebase. After the build scripts are executed, the updated variable name will be reflected in the compiled build.

[ricmoo]

This is unfortunately a non-backwards compatible change and cannot be made until the next major version bump.

In the next minor bump, I could possibly add it as an alias, if it matters?

[reza-sadeghzadeh]

Thank you for explaining the situation and considering my PR.
I'll continue to work with the current version and I appreciate your willingness to add it as an alias in the next minor version.