Remove try_main and return Result #181
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Since main can now return a result, the documentation examples that use `?` can be simplified. This is also the method used by the [rustdoc documentation](https://doc.rust-lang.org/rustdoc/documentation-tests.html).
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Since main can now return a result, the documentation examples that use
?can be simplified. This is also the method used by the rustdoc documentation.