Update webpack from 3.7.1 to 3.8.1 in app/react-native

[dependencies]

webpack has been updated to 3.8.1 in app/react-native by dependencies.io

3.8.1

Bugfixes:

• add missing keys to stats schema for validation

3.8.0

Features:

• It's now possible to include the --env data in stats (jbottigliero)
• There is a warning when trying to load a initial chunk with import() or require.ensure now (sokra)

Bugfixes:

• fix a race condition for ENOENT errors (simon-paris)
• chunk reasons comments are not set more consistent (sokra)
• fix schema for stats and be more strict (jbottigliero)
  • This may lead to errors if you've provided wrong properties.
• remove the absolute path from the parser error message (sokra)
• fix changed behavior when loading a initial chunk on demand (sokra)

Performance

• chunk graph is now build in breath-first traversal, which is faster (sokra)
• fix a performance problem in some edge cases (sokra)

[codecov]

Codecov Report

Merging #2072 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2072   +/-   ##
=======================================
  Coverage   21.34%   21.34%           
=======================================
  Files         262      262           
  Lines        5767     5767           
  Branches      692      690    -2     
=======================================
  Hits         1231     1231           
- Misses       4002     4012   +10     
+ Partials      534      524   -10

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
lib/ui/src/modules/ui/components/menu_item.js	19.14% <0%> (ø)	⬆️
addons/knobs/src/components/types/Number.js	8.06% <0%> (ø)	⬆️
addons/knobs/src/KnobManager.js	32% <0%> (ø)	⬆️
addons/knobs/src/components/types/Select.js	7.93% <0%> (ø)	⬆️
addons/knobs/src/react/WrapStory.js	20% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	47.36% <0%> (ø)	⬆️
addons/knobs/src/components/PropField.js	10.86% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/layout/usplit.js	38.7% <0%> (ø)	⬆️
... and 30 more

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