Update Rinkeby token list

[fedgiac]

Currently, our default token list has just three tokens:

$ curl https://raw.githubusercontent.com/Uniswap/token-lists/master/test/schema/bigexample.tokenlist.json  | jq '.tokens[] | select(.chainId == 4)'
{
  "address": "0xc778417E063141139Fce010982780140Aa0cD5Ab",
  "chainId": 4,
  "name": "Wrapped Ether",
  "symbol": "WETH",
  "decimals": 18
}
{
  "address": "0xc7AD46e0b8a400Bb3C915120d284AafbA8fc4735",
  "chainId": 4,
  "name": "Dai Stablecoin",
  "symbol": "DAI",
  "decimals": 18
}
{
  "address": "0xF9bA5210F91D0474bd1e1DcDAeC4C58E359AaD85",
  "chainId": 4,
  "name": "Maker",
  "symbol": "MKR",
  "decimals": 18
}

After fixing #23, we could use a larger list, for example here are the lists used by the frontend.

[fleupold]

Note, that the default rinkeby token list is actually a much larger list. I changed this in our kubernetes setup, because with a larger list we were even more frequently running into issues where we got stuck in some weird coin for which liquidity only exists sporadically or in one direction.

I'm not sure that a larger list of tokens will actually give us more signal, what do you think?