Allow JSON output from clients:create and authorizations:create

[ojacobson]

Sometimes you need more than just the token, in a parseable form. I'm using it like this:

heroku authorizations:create \
  --description "Example app dev env: ${HEROKU_APP}" \
  --scope identity \
  --expires-in $((3 * 24 * 60 * 60)) \
  --json |
  jq -r '.id + " " + .access_token.token' |
  read HEROKU_OAUTH_ID HEROKU_OAUTH_SECRET

[codecov-io]

Codecov Report

Merging #30 into master will decrease coverage by 1.42%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   99.23%   97.81%   -1.43%     
==========================================
  Files          15       15              
  Lines         130      137       +7     
==========================================
+ Hits          129      134       +5     
- Misses          1        3       +2

Impacted Files	Coverage Δ
commands/clients/create.js	85.71% <80%> (-5.96%)	⬇️
commands/authorizations/create.js	92.3% <88.88%> (-7.7%)	⬇️

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