Prep iOS release 3.2.0

[echo-branch]

Reference

SDK-2240 Prep iOS 3.2.0 release

Summary

Update changelog and version

Motivation

Type Of Change

• This change requires a documentation update

Testing Instructions

Confirm changelog and version changes look ok

cc @BranchMetrics/saas-sdk-devs for visibility.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5ef342a) 51.02% compared to head (c7f50be) 51.02%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1352   +/-   ##
=======================================
  Coverage   51.02%   51.02%           
=======================================
  Files          66       66           
  Lines       10143    10143           
  Branches     3722     3721    -1     
=======================================
  Hits         5175     5175           
  Misses       4702     4702           
  Partials      266      266           

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