Upgrading afero dependency

[LandonTClipp]

New dependency adds the LstatIfPossible function to memmapfs

This fixes #21

[codecov]

Codecov Report

Merging #22 into master will increase coverage by 0.86%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   75.33%   76.20%   +0.86%     
==========================================
  Files           2        2              
  Lines         369      290      -79     
==========================================
- Hits          278      221      -57     
+ Misses         60       41      -19     
+ Partials       31       28       -3     

Impacted Files	Coverage Δ
path.go	75.41% <100.00%> (-1.23%)	⬇️
walk.go	77.47% <0.00%> (+4.67%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1e22e38...d0707b6. Read the comment docs.