structopt 0.3.1

Parse command line argument by defining a struct.
Documentation 
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error: `#[structopt(raw(...))` attributes are deprecated in structopt 0.3, only `raw(true)` and `raw(false)` are allowed
  --> $DIR/raw.rs:13:17
   |
13 |     #[structopt(raw(case_insensitive = "true"))]
   |                 ^^^