Peacher (v1.5.7)

This is a bug fix release that resolves several regressions related to hex handling in the RPC API.
See the 1.5.7 milestone for more details.

There are a few other changes in this release:

• The geth console now uses web3.js v0.18.1 (#3545)
• --olympic is gone (#3553)
• A hang in the light client is resolved (#3568)

As always, you can install/update via your favorite package manager, or download pre-built binaries from our downloads page at https://geth.ethereum.org/downloads/