We had forgotten to add `eslint` as a dependency, even though we use it
directly. It had always worked because we have dependencies that also
depend upon it.
`eslint` has also been updated to v6, which necessitated two minor
changes.
* Adds 4byte registry fallback to getMethodData() (#6435)
* Adds fetchWithCache to guard against unnecessary API calls
* Add custom fetch wrapper with abort on timeout
* Use opts and cacheRefreshTime in fetch-with-cache util
* Use custom fetch wrapper with timeout for fetch-with-cache
* Improve contract method data fetching (#6623)
* Remove async call from getTransactionActionKey()
* Stop blocking confirm screen rendering on method data loading, and base screen route on transactionCategory
* Remove use of withMethodData, fix use of knownMethodData, in relation to transaction-list-item.component
* Load data contract method data progressively, making it non-blocking; requires simplifying conf-tx-base lifecycle logic.
* Allow editing of gas price while loading on the confirm screen.
* Fix transactionAction component and its unit tests.
* Fix confirm transaction components for cases of route transitions within metamask.
* Only call toString on id if truthy in getNavigateTxData()
* Fix knownMethodData retrieval and data fetching from fourbyte
