Fix yarn install warnings during Stepup-tiqr build

This issue is imported from pivotal - Originaly created at Aug 1, 2019 by Pieter van der Meulen

yarn install had warnings during build. We should look into these / fix them:

> yarn install
yarn install v1.13.0
warning package.json: No license field
warning No license field
[1/4] Resolving packages...
[2/4] Fetching packages...
info fsevents@1.2.4: The platform "linux" is incompatible with this module.
info "fsevents@1.2.4" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning " > sass-loader@6.0.7" has unmet peer dependency "webpack@^2.0.0 || ^3.0.0 || ^4.0.0".
warning " > ts-jest@23.1.4" has unmet peer dependency "babel-core@^6.0.0 || ^7.0.0-0".
warning " > ts-jest@23.1.4" has unmet peer dependency "babel-jest@^23.0.0 || ^24.0.0".
[4/4] Building fresh packages...
Done in 57.19s.
Composer install done
copy bootstrap cache
run composer encore production
> ./node_modules/.bin/encore \'production\'
Running webpack ...

(node:19212) DeprecationWarning: Chunk.modules is deprecated. Use Chunk.getNumberOfModules/mapModules/forEachModule/containsModule instead.
 DONE  Compiled successfully in 26917ms1:39:09 PM

 I  8 files written to web/build

EST. 4h

OpenConext / Stepup-tiqr

Fix yarn install warnings during Stepup-tiqr build #273