Eduardo Fernandes

### issue: running `cargo build` and `cargo test` gives multiple deprecation warnings ### rust version: `rustc 1.57.0 (f1edd0429 2021-11-29)`

fix all compiler warnings given by `cargo build` and `cargo test` Fixes #217

[1.4] Terms 'axis' and 'basis' are mixed up

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### Describe the issue At the beginning of section _4. Digression: Measuring in Different Bases_ we can see the following text: > We have seen that the Z-axis is not...

### Describe the issue At the end of section _7. The U-gate_ we can see the following sentence: > These gates do a quarter-turn with respect to the X-axis around...

When trying to add a collaborator to a recently created repo it gives the following message: ``` Error: reference does not exist ``` When trying again the following message appears:...