moved ServePlugin to both env

[jsonporter]

This commit moves the webpack-plugin-serve middleware to apply to both prod and dev builds

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

Serve middleware sets the MIME type of main-[hash].js to `application/javascrtipt'. This middleware was initially configured to apply to dev-only; this change applies it to both prod and dev builds.

Tracking Issue

Follow-up issue

#235

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5e83da6). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #238   +/-   ##
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  Coverage          ?   63.44%           
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  Files             ?      365           
  Lines             ?     7909           
  Branches          ?     1385           
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  Hits              ?     5018           
  Misses            ?     2891           
  Partials          ?        0           

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