incorrect case-sensitive comparison for addresses

[smarx]

Address comparisons should be case-insensitive, but the comparison here is case-sensitive:

https://github.com/kumavis/eth-json-rpc-filters/blob/fa163bc215044221656bc8e5a29569ee5013d27f/log-filter.js#L68

This leads to problems when filtering logs using a mixed-case address. I believe that a .toLowerCase() is all that's required to fix this bug. In the meantime, the workaround is for developers to specify contract addresses in all lowercase.

This is potentially one thing leading to #2 and MetaMask/metamask-extension#2393, but the main issue in the latter appears to be more about the timing, lifecycle, and interaction of various objects (providers, block trackers and filter middlewares).

[kumavis]

Thanks! fixed in 1.2.5