Update docs to use go install instead of go get

[cbliard]

go get -u github.com/danielgtaylor/shorthand/cmd/j did not work for me. I ran it from a golang docker container because I do not have any go development environment available. Following error messages from the go command, I ended up with go install github.com/danielgtaylor/shorthand/cmd/j@latest which worked and installed the j executable in /go/bin/j.

[danielgtaylor]

Thanks!

[codecov]

Codecov Report

Merging #227 (0a1f26c) into main (c4befd0) will not change coverage.
Report is 2 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #227   +/-   ##
=======================================
  Coverage   76.92%   76.92%           
=======================================
  Files          26       26           
  Lines        3666     3666           
=======================================
  Hits         2820     2820           
  Misses        639      639           
  Partials      207      207           

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