Add currencies to charts

[dlebech]

Closes #55

[codecov]

Codecov Report

Merging #66 into master will increase coverage by 1.56%.
The diff coverage is 93.85%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   72.34%   73.91%   +1.56%     
==========================================
  Files          56       58       +2     
  Lines        1074     1150      +76     
==========================================
+ Hits          777      850      +73     
- Misses        297      300       +3

Impacted Files	Coverage Δ
src/reducers/app.js	85.71% <ø> (-6.6%)	⬇️
src/components/Transactions.js	48.97% <ø> (ø)	⬆️
src/reducers/edit.js	100% <100%> (ø)	⬆️
src/components/transactions/TransactionRow.js	84.21% <100%> (ø)	⬆️
src/lambda/currencyRates.js	100% <100%> (ø)	⬆️
src/util.js	84.26% <100%> (+1.55%)	⬆️
src/lambda/currencies.js	100% <100%> (ø)	⬆️
src/lambda/eurofx/index.js	100% <100%> (ø)	⬆️
src/components/charts/AmountCard.js	100% <100%> (ø)	⬆️
src/components/charts/CategoryTreeMap.js	77.77% <77.77%> (ø)
... and 6 more

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