Incorrect code sample of update method in readme.md

[ndjndj]

Hello, thank you for maintenance of this gem.

Probably related to issue #657.

I found what incorrect code sample of update method in readme.md.

.update method does not accept conditions as arguments.

dynamoid/lib/dynamoid/persistence.rb

Line 232 in 6b96d1d

def update(hash_key, range_key_value = nil, attrs)

Therefore, the following code as shown in the sample will fail.

Address.update(id, { city: 'Chicago' }, if: { deliverable: true })

So I removed this code sample.

thank you!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a5b7640) 90.89% compared to head (d9dd786) 90.89%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #720   +/-   ##
=======================================
  Coverage   90.89%   90.89%           
=======================================
  Files          71       71           
  Lines        3414     3414           
=======================================
  Hits         3103     3103           
  Misses        311      311           

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[andrykonchin]

Thank you! Could you please rebase the branch on master?

[ndjndj]

I’m sorry. Is this correct?

[andrykonchin]

Could you please squash all commits into one? I would do it myself and push with force into your branch but it seems it's not permitted.

[ndjndj]

I'm sorry but I accidentaly broke branch.
I apologize for the repeated trouble.
I will create a new branch and submit a new pull request.