In "updating modals" code example, ove 'type' to be nested inside 'view'

[yamashush]

Summary

To fix the issue described in #317

It looks like the example on https://slack.dev/bolt/concepts#updating-pushing-views has type at the top level object but it should actually be nested in view as shown in https://api.slack.com/reference/block-kit/views

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[CLAassistant]

All committers have signed the CLA.

[seratch]

The build failures seem to be unrelated. Looks good to me.

Good catch, thanks 👍

[seratch]

After merging #321 and rebasing onto master, we'll be able to merge this.

[codecov]

Codecov Report

Merging #318 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #318   +/-   ##
=======================================
  Coverage   73.71%   73.71%           
=======================================
  Files           7        7           
  Lines         506      506           
  Branches      145      145           
=======================================
  Hits          373      373           
  Misses        101      101           
  Partials       32       32

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[seratch]

Finally, the CI builds are successful 😌
@yamashush good catch! Thanks again 🙇