v0.6.4

🐘 🐘

This release upgrades the coverage client testrpc-sc to 6.5.1, tracking ganache-cli. There are some long-awaited bug fixes arriving from upstream...

• Block timestamps no longer float within a given block. The non-static (and erroneous) behavior was especially noticeable when running coverage because it's slower.
• The value of eth_blockNumber and the Solidity global block.number are now identical, instead of off-by-one.

Thanks to @barakman for reporting and keeping on top of these.