Update nodes

[JamesSmartCell]

• Remove Heco Test
• Update Heco RPC
• Update Heco logo

[github-actions[bot]]

Pull reviewers stats

Stats of the last 30 days for alpha-wallet-android:		User	Total reviews	Time to review	Total comments

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files	Coverage Δ
app/src/main/java/com/alphawallet/app/C.java	57.14% <ø> (ø)
...lphawallet/app/repository/EthereumNetworkBase.java	46.24% <100.00%> (-0.43%)	:arrow_down:

:loudspeaker: Thoughts on this report? Let us know!.