atty potential unalined read

[greymd]

This bug is created from a dependabot alert

Following crates are using atty internally.

• env_logger 0.7.1
• structopt v0.3.26
• criterion v0.3.6

$ cargo tree | grep -C 5 atty
teip v2.3.0 ..
├── cfg-if v0.1.10
├── env_logger v0.7.1
│   ├── atty v0.2.14
│   │   └── libc v0.2.139
│   ├── humantime v1.3.0
│   │   └── quick-error v1.2.3
│   ├── log v0.4.17
│   │   └── cfg-if v1.0.0
--
│           ├── quote v1.0.23 (*)
│           └── unicode-ident v1.0.6
└── structopt v0.3.26
    ├── clap v2.34.0
    │   ├── ansi_term v0.12.1
    │   ├── atty v0.2.14 (*)
    │   ├── bitflags v1.3.2
    │   ├── strsim v0.8.0
    │   ├── textwrap v0.11.0
    │   │   └── unicode-width v0.1.10
    │   ├── unicode-width v0.1.10
--
│   │   ├── predicates-core v1.0.5
│   │   └── termtree v0.4.0
│   └── wait-timeout v0.2.0
│       └── libc v0.2.139
└── criterion v0.3.6
    ├── atty v0.2.14 (*)
    ├── cast v0.3.0
    ├── clap v2.34.0 (*)
    ├── criterion-plot v0.4.5
    │   ├── cast v0.3.0
    │   └── itertools v0.10.5 (*)

I will try to upgrade those crates and see if this alert is gone or not.

[greymd]

structopt is in maintainance mode. We need to replace it to clap to remove atty.
https://github.com/TeXitoi/structopt