Handle Required field update in CNAB spec

[jcsirot]

- What I did Bump cnab-go dependency and adapt the code and tests to the Bundle struct update

- A picture of a cute animal (not mandatory but encouraged)

[codecov[bot]]

Codecov Report

Merging #588 into master will increase coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #588      +/-   ##
==========================================
+ Coverage      71%   71.03%   +0.03%     
==========================================
  Files          55       55              
  Lines        3242     3235       -7     
==========================================
- Hits         2302     2298       -4     
+ Misses        644      642       -2     
+ Partials      296      295       -1

Impacted Files	Coverage Δ
internal/commands/parameters.go	87.8% <100%> (-0.71%)	:arrow_down:
internal/packager/cnab.go	97.33% <100%> (-0.04%)	:arrow_down:
types/parameters/parameters.go	96.82% <0%> (+4.76%)	:arrow_up:

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[jcsirot]

closed in favor of #596