changelog: update for v2.0.0

Author: vsergeev

CHANGELOG.md

@@ -1,3 +1,32 @@
+* v2.0.0 - 10/28/2019
+    * GPIO
+        * Add support for character device GPIOs.
+        * Remove support for preserve direction from GPIO constructor.
+        * Add retry loop to direction write after export to accommodate delayed
+          udev permission rule application for sysfs GPIOs.
+        * Unexport GPIO line on close for sysfs GPIOs.
+        * Fix handling of `timeout=None` with sysfs GPIO `poll()`.
+        * Add `devpath` property.
+    * PWM
+        * Fix chip and channel argument names in PWM constructor and
+          documentation.
+        * Add retry loop to PWM open after export to accommodate delayed
+          creation of sysfs files by kernel driver.
+        * Unexport PWM channel on close.
+        * Add nanosecond `period_ns` and `duty_cycle_ns` properties.
+        * Add `devpath` property.
+    * LED
+        * Raise `LookupError` instead of `ValueError` if LED name is not found
+          during open.
+        * Add `devpath` property.
+    * Fix exception handling for Python 2 with `ioctl()` operations in Serial,
+      SPI, and I2C modules.
+    * Fix `with` statement context manager support for all modules.
+    * Update tests with running hints for Raspberry Pi 3.
+    * Contributors
+        * Uwe Kleine-König, @ukleinek - 0005260
+        * Heath Robinson, @ubiquitousthey - ac457d6
+
 * v1.1.2 - 06/25/2019
     * Add LICENSE file to packaging.