* debug prints
* CI: enable stack traces
* Azure: better NimBinaries cache key
* CI changes
- Azure: remove Linux target
- Travis: add ARM64 target
* uglify the code in order to save 12 bytes per LPStream object
* fix: don't allow replacing pubkey
* fix: several small improvements
* removing pubkey setter
* improove error handling
* remove the use of Option[T] if not needed
* don't use optional
* fix-ci: temporarily pin p2pd to a working tag
* fix example to comply with latest changes
* bumping p2pd again to a higher version