Add optional output filename option -o to ska weed.

[tmaklin]

Adds an optional output filename argument to ska weed. Default behavior still is to overwrite the input but the new argument adds some flexibility. This may be useful to people who don't want to overwrite their inputs.

[johnlees]

Seems like a very sensible addition – not sure why the tests aren't running though, maybe some github branch thing I've set up wrong. I've added you as a collaborator now if you want to use an internal branch.
You also need to bump the version number to pass that test.
If you don't have time I can sort this out in the next few weeks (travelling for a while)

[tmaklin]

thanks, I'll give it a try

[codecov]

Codecov Report

Patch coverage: 80.00% and project coverage change: -0.10% ⚠️

Comparison is base (7237159) 92.51% compared to head (1a061af) 92.42%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
- Coverage   92.51%   92.42%   -0.10%     
==========================================
  Files          16       16              
  Lines        2192     2152      -40     
==========================================
- Hits         2028     1989      -39     
+ Misses        164      163       -1     

Files Changed	Coverage Δ
src/cli.rs	73.96% <50.00%> (-0.45%)	⬇️
src/lib.rs	80.94% <100.00%> (-0.86%)	⬇️

... and 6 files with indirect coverage changes

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[johnlees]

All looks good. Don't know why test jobs didn't run, but codecov did so that means they are passing. Thanks for the contribution!