deps: bump to nias v0.7.0

[calebcartwright]

Changes

• [x] Updates nias to v0.7.0 to get support for setting environment variables for the command runner
• [x] Add a test util function for generating the stub closure since the signature's starting to get gnarly

Related Issues

• Refs #25
• Refs #113

[codecov[bot]]

Codecov Report

Merging #121 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #121   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          138       137    -1     
=========================================
- Hits           138       137    -1     

Impacted Files	Coverage Δ
src/git.rs	100.00% <ø> (ø)
src/rusty_hook.rs	100.00% <100.00%> (ø)

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