Use native signal context

[insidieux]

Description

Removed github.com/sethvargo/go-signalcontext
Use native signal package

Fixes #6

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• This PR has been tested for backwards compatibility

[codecov-io]

Codecov Report

Merging #7 (9ef4ea6) into master (0196e3a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          260       260           
=========================================
  Hits           260       260           

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