Only emit rule delete if json flag is given.

[rabbah]

Description

Adds --json to rule delete and emits API response only when flag is present.

Related Issue

Fixes #112.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #113 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #113   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          57     57           
  Lines        1741   1743    +2     
  Branches      303    304    +1     
=====================================
+ Hits         1741   1743    +2

Impacted Files	Coverage Δ
src/commands/runtime/rule/delete.js	100% <100%> (ø)	⬆️

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