Add support for `../`

[anmolbabu]

This PR adds support for auto-completion of file paths starting ..

Signed-off-by: anmolbabu [email protected]

[codecov[bot]]

Codecov Report

Merging #80 into master will decrease coverage by 0.2%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
- Coverage   89.93%   89.72%   -0.21%     
==========================================
  Files          14       14              
  Lines         864      866       +2     
==========================================
  Hits          777      777              
- Misses         77       78       +1     
- Partials       10       11       +1

Impacted Files	Coverage Δ
utils.go	63.63% <0%> (-6.37%)	:arrow_down:

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[anmolbabu]

@posener Please review