Same as 4.0.4.

V4.0.4

------

* Improvement: Remove Bluetooth specification PDFs, refer to bluetooth.com to
  avoid copyright issues.
* Improvement: Add wait_for_response option to subscription methods

Same as v4.0.2

V4.0.2

------

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

V4.0.1

------

* Improvement: Wait longer for characteristics discovery with BGAPI backend (peplin#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

V4.0.0

------

* Feature: Add ``char_read_long`` for reading characteristics longer than a
  single packet (peplin#206, peplin#177)
* Feature: Add command to change MTU (GATTTool only) (peplin#182)
* Feature: Allow registering callbacks for device discovery events. (peplin#176)
* Feature: Support fetching BLE device MAC address (peplin#150)
* Improvement: Add better serial port error handling for BGAPI. (peplin#162)
* Improvement: Expand and allow overriding pexpect search buffer for gatttool
  output to support devices with many characteristics without negatively
  impacting performance (peplin#209)
* Improvement: Wait before re-opening BGAPI serial port to improve detection on
  Windows. (peplin#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 (peplin#154)
* Fix: Stop leaking file descriptors when erasing BLE bonds with GATTTool
  backend (peplin#188)
* Fix: Typos (peplin#173)
* Drop official support for Python 3.4, 3.5 and 3.6.

Release v3.2.0

- Fix: Reliably auto-reconnect after restarting BGAPI device. Fixes a bug in
  first attempt at auto-reconnection, only worked in some environments. (peplin#144)
- Fix: Remove spurious "no handler for logger" warnings (peplin#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. (peplin#123)
- Feature: Add support for write commands to BGAPIBackend (peplin#115)

Convert docs to RST.

Release v3.1.0.

* Fix: Support platforms without `termios` (Windows)
* Feature: Add `char_read_handle` to GATTTool backend.
* Improvement: Warn if `hcitool` requires a sudo authentication.
* Improvement: Allow BGAPI device more time to reboot for more reliable
  discovery.
* Improvement: Interpret "invalid file descriptor" as a disconnect event.
* Fix: Correctly handle service class UUIDs that aren't 16 bytes.
* Improvement: Support BLE devices with any UTF8 character.
* Improvement: Make gatttol prompt timeout configurable.
* Improvement: Gracefully stop `lescan` to avoid leaving the adapter in a bad
  state.
* Improvement: Allow custom timeout for discovery on GATTTool backend.
* Fix: Make sure responses to char reads on BGAPI backend are from the requested
  handle.
* Improvement: Raise and exception if trying to instantiate the GATTTool backend
  in Windows.
* Improvement: If no BGAPI device attached, abort immediately.
* Fix: Use user's configured HCI device for connection and scanning in GATTTool
  backend.

Python 3 support and performance improvements.