- Update to version 34.0.0
* Upgrade to platform-tools-34.0.0 (see #106)

* adb
- Fixed zero length packet sends for macOS
(issuetracker: 208675141).
- Addressed unstable connectivity (MacBook high speed cable):
frequent adb disconnects.
- Improved error message for adb push with insufficient number
of arguments.

* fastboot
- Improved flashing: flashall will now skip reboots to
userspace if it can.
- Fixed zero length packet sends for macOS
(issuetracker: 208675141).
- Fixed flashing recovery.img resulting in wrong AVB footer.