Commits on Jun 10, 2021

1. Depend on a recent-enough version of backtrace …

   If backtrace v0.3.50 or earlier is used, the following compile errors result:
   
   ```
   error[E0599]: no method named `print_raw_with_column` found for struct `BacktraceFrameFmt<'_, '_, '_>` in the current scope
      --> /Users/john/.cargo/registry/src/github.com-1ecc6299db9ec823/anyhow-1.0.40/src/backtrace.rs:284:27
       |
   284 |                         f.print_raw_with_column(
       |                           ^^^^^^^^^^^^^^^^^^^^^ method not found in `BacktraceFrameFmt<'_, '_, '_>`
   
   error[E0599]: no method named `colno` found for reference `&Symbol` in the current scope
      --> /Users/john/.cargo/registry/src/github.com-1ecc6299db9ec823/anyhow-1.0.40/src/backtrace.rs:353:39
       |
   353 |                         colno: symbol.colno(),
       |                                       ^^^^^ method not found in `&Symbol`
   
   ```
   
   `print_raw_with_column` and `colno` were added in [this PR](rust-lang/backtrace-rs@4b8f2be), and the earliest backtrace version they are available in is 0.3.51.

   

   jfirebaugh committed Jun 10, 2021
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