doesn't work with rustc 1.53.0

[jarret]

The workaround is to revert to 1.47.0. Thanks to Javier for helping me get running.

When using 1.53.0 the release build panics upon running with the message:

thread 'main' panicked at 'attempted to leave type `lru::LruEntry<bitcoin_hashes::sha256d::Hash, (std::vec::Vec<bitcoin_hashes::sha256d::Hash>, usize)>` uninitialized, which is invalid', /build/rustc-Nbf2Kl/rustc-1.53.0+dfsg1+llvm/library/core/src/mem/mod.rs:660:9