Pygatt

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* Improvement: Remove Bluetooth specification PDFs, refer to bluetooth.com to
avoid copyright issues.

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* Fix: Regression with receiving indications with GATTTOOL backend
* Fix: Regression with subscribing to characteristics with GATTTOOL (need to use
writes, not commands) (234)
* Improvement: Don't require sudo for removing bonding (234)

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* Improvement: Wait longer for characteristics discovery with BGAPI backend (201)
* Fix: Protect against invalid BGAPI packets
* Fix: Fix parsing fields from BGAPI connection status
* Fix: Robust to non-UTF8 characters in hcitool scan results
* Fix: Log correct connection flags from BGAPI response

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* Feature: Add ``char_read_long`` for reading characteristics longer than a
single packet (206, 177)
* Feature: Add command to change MTU (GATTTool only) (182)
* Feature: Allow registering callbacks for device discovery events. (176)
* Feature: Support fetching BLE device MAC address (150)
* Improvement: Add better serial port error handling for BGAPI. (162)
* Improvement: Expand and allow overriding pexpect search buffer for gatttool
output to support devices with many characteristics without negatively
impacting performance (209)
* Improvement: Wait before re-opening BGAPI serial port to improve detection on
Windows. (162)
* Improvement: Add support for Python 3.7
* Fix: Use ATT write (not command) by default for char_write
* Fix: Wait longer for ATT write according to BlueGiga spec
* Fix: Fix BGAPI device detection (154)
* Fix: Stop leaking file descriptors when erasing BLE bonds with GATTTool
backend (188)
* Fix: Typos (173)
* Drop official support for Python 3.4, 3.5 and 3.6.

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- Improvement: Officially support Python 3.6.
- Improvement: Permit use of non-standard characteristics in reserved range (140)

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- Fix: Reliably auto-reconnect after restarting BGAPI device. Fixes a bug in
first attempt at auto-reconnection, only worked in some environments. (144)
- Fix: Remove spurious "no handler for logger" warnings (143)
- Fix: Use enum-compat instead of enum34, to fix installation in Python 3.4+
- Feature: Limit search window size for GATTTool backend, to avoid high CPU
usage for long running connections. (123)
- Feature: Add support for write commands to BGAPIBackend (115)