Update postcss-loader in lib/core from 2.1.1 to 2.1.2

[dependencies]

Dependencies.io has updated postcss-loader (a npm dependency in lib/core) from "2.1.1" to "2.1.2".

2.1.2

No content found. Please open an issue at https://github.com/dependencies-io/support if you think this content could have been found.

[codecov]

Codecov Report

Merging #3234 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3234   +/-   ##
=======================================
  Coverage   35.95%   35.95%           
=======================================
  Files         437      437           
  Lines        9473     9473           
  Branches      896      894    -2     
=======================================
  Hits         3406     3406           
- Misses       5497     5518   +21     
+ Partials      570      549   -21

Impacted Files	Coverage Δ
app/vue/src/server/utils.js	0% <0%> (-100%)	⬇️
lib/ui/src/modules/api/index.js	0% <0%> (ø)	⬆️
addons/storysource/src/loader/inject-decorator.js	30.43% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
lib/core/src/client/preview/reducer.js	37.5% <0%> (ø)	⬆️
addons/actions/src/lib/util/getPropertiesList.js	60% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/shortcuts_help.js	12.85% <0%> (ø)	⬆️
addons/knobs/src/components/types/Date/index.js	23.52% <0%> (ø)	⬆️
addons/info/src/components/PropVal.js	84.25% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/shortcuts_help.js	25% <0%> (ø)	⬆️
... and 60 more

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