Export updated assignments when using shorthand update assignment expressions in SystemJS

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
Resolves #3238

Description

See #3238

[codecov]

Codecov Report

Merging #3242 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3242      +/-   ##
==========================================
+ Coverage   91.27%   91.27%   +<.01%     
==========================================
  Files         170      170              
  Lines        5923     5926       +3     
  Branches     1794     1795       +1     
==========================================
+ Hits         5406     5409       +3     
  Misses        311      311              
  Partials      206      206

Impacted Files	Coverage Δ
src/utils/renderHelpers.ts	100% <100%> (ø)	⬆️
src/ast/nodes/AssignmentExpression.ts	95.23% <100%> (+0.79%)	⬆️

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