cargo update

Also manually bumped to the latest `clap` beta.

```
Updating addr2line v0.15.2 -> v0.16.0
Updating ammonia v3.1.1 -> v3.1.2
Updating anyhow v1.0.41 -> v1.0.43
Updating backtrace v0.3.60 -> v0.3.61
Removing base64 v0.12.3
Updating bitflags v1.2.1 -> v1.3.2
Updating cc v1.0.68 -> v1.0.69
Updating clap v3.0.0-beta.2 -> v3.0.0-beta.4
Updating clap_derive v3.0.0-beta.2 -> v3.0.0-beta.4
Updating cookie v0.15.0 -> v0.15.1
Updating crypto-mac v0.10.0 -> v0.10.1
Updating fastrand v1.4.1 -> v1.5.0
Updating filetime v0.2.14 -> v0.2.15
Updating futures-channel v0.3.15 -> v0.3.16
Updating futures-core v0.3.15 -> v0.3.16
Updating futures-io v0.3.15 -> v0.3.16
Updating futures-macro v0.3.15 -> v0.3.16
Updating futures-sink v0.3.15 -> v0.3.16
Updating futures-task v0.3.15 -> v0.3.16
Updating futures-util v0.3.15 -> v0.3.16
Updating gimli v0.24.0 -> v0.25.0
Updating git2 v0.13.20 -> v0.13.21
Updating hashbrown v0.9.1 -> v0.11.2
Updating http-body v0.4.2 -> v0.4.3
Updating httparse v1.4.1 -> v1.5.0
Updating hyper v0.14.9 -> v0.14.11
Updating indexmap v1.6.2 -> v1.7.0
Updating instant v0.1.9 -> v0.1.10
Updating jobserver v0.1.22 -> v0.1.24
Updating js-sys v0.3.51 -> v0.3.52
Updating libc v0.2.97 -> v0.2.99
Updating libgit2-sys v0.12.21+1.1.0 -> v0.12.22+1.1.0
Updating matches v0.1.8 -> v0.1.9
Updating memchr v2.4.0 -> v2.4.1
Updating native-tls v0.2.7 -> v0.2.8
Updating oauth2 v4.0.0 -> v4.1.0
Updating object v0.25.3 -> v0.26.1
Updating openssl v0.10.35 -> v0.10.36
Updating openssl-sys v0.9.65 -> v0.9.66
Updating os_str_bytes v2.4.0 -> v3.1.0
Updating proc-macro2 v1.0.27 -> v1.0.28
Updating protobuf v2.24.1 -> v2.25.0
Updating redox_syscall v0.2.9 -> v0.2.10
Updating semver v1.0.3 -> v1.0.4
Updating serde v1.0.126 -> v1.0.127
Updating serde_derive v1.0.126 -> v1.0.127
Updating serde_json v1.0.64 -> v1.0.66
Updating sha-1 v0.9.6 -> v0.9.7
Updating sharded-slab v0.1.1 -> v0.1.3
Updating siphasher v0.3.5 -> v0.3.6
Updating slab v0.4.3 -> v0.4.4
Updating socket2 v0.4.0 -> v0.4.1
Updating subtle v2.4.0 -> v2.4.1
Updating syn v1.0.73 -> v1.0.74
Updating tar v0.4.35 -> v0.4.37
Updating textwrap v0.12.1 -> v0.14.2
Updating thiserror v1.0.25 -> v1.0.26
Updating thiserror-impl v1.0.25 -> v1.0.26
Updating tinyvec v1.2.0 -> v1.3.1
Updating tokio v1.7.1 -> v1.10.0
Updating tokio-macros v1.2.0 -> v1.3.0
Updating tokio-stream v0.1.6 -> v0.1.7
Updating tracing-core v0.1.18 -> v0.1.19
Updating tracing-subscriber v0.2.19 -> v0.2.20
Updating unicode-bidi v0.3.5 -> v0.3.6
Updating unicode-segmentation v1.7.1 -> v1.8.0
Updating universal-hash v0.4.0 -> v0.4.1
Updating wasm-bindgen v0.2.74 -> v0.2.75
Updating wasm-bindgen-backend v0.2.74 -> v0.2.75
Updating wasm-bindgen-futures v0.4.24 -> v0.4.25
Updating wasm-bindgen-macro v0.2.74 -> v0.2.75
Updating wasm-bindgen-macro-support v0.2.74 -> v0.2.75
Updating wasm-bindgen-shared v0.2.74 -> v0.2.75
Updating web-sys v0.3.51 -> v0.3.52
Updating zeroize v1.3.0 -> v1.4.1
```

Author: jtgeibel