Fix/make it compile

[marius-vinted]

• FIx these:

   Compiling vinted_event_tracker v0.1.0 (/Users/marius/vinted/event-tracker-rs)
error: lint `const_err` has been removed: converted into hard error, see issue #71800 <https://github.com/rust-lang/rust/issues/71800> for more information
 --> src/lib.rs:5:5
  |
5 |     const_err,
  |     ^^^^^^^^^
  |
note: the lint level is defined here
 --> src/lib.rs:3:5
  |
3 |     warnings,
  |     ^^^^^^^^
  = note: `#[deny(renamed_and_removed_lints)]` implied by `#[deny(warnings)]`

error: lint `private_in_public` has been removed: replaced with another group of lints, see RFC <https://rust-lang.github.io/rfcs/2145-type-privacy.html> for more information
  --> src/lib.rs:13:5
   |
13 |     private_in_public,
   |     ^^^^^^^^^^^^^^^^^

error: could not compile `vinted_event_tracker` (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
error: could not compile `vinted_event_tracker` (lib test) due to 2 previous errors

• Add info how to run local example for common folks

[buinauskas]

Solved in #30