Add changelog of hardware documentation

Change-Id: Id8ba4f194bc7a868e17bf235148ba89a1a4845b3

diff --git a/hw/MuxPi/changelog.txt b/hw/MuxPi/changelog.txt
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+MuxPi hardware changelog.
+
+Note: Hardware versioning is not related to git tags of this repository.
+
+1.0 - 2017-01-18 - never published
+       Initial release
+       Main components:
+       - NanoPi NEO v1.1 and v1.2 compatible socket
+       - 4-wire UART level shifter
+       - Watchdog timer (ATtiny)
+       - Power control & current measurement
+       - STM32 microntroller handling:
+               * SD-MUX module
+               * DyPers
+               * UI (OLED 128x32, 2xRGB LED, push buttons)
+               * HDMI/DDC
+               * DUT's power switch
+               * DUT's power consumption measurement
+       - 2 port USB hub with integrated SD card reader
+       - USB<->ETH converter
+       - SD-MUX
+       - 2x 2-channel DyPers
+       - HDMI/DDC
+
+1.1 - 2018-02-01
+       Added Cortex-M0 flashing from NanoPi NEO capability
+       Added reverse-polarity protection
+       Added USB-M circuitry
+       Added voltage genreator for DUT UART
+       Added NanoPi NEO debug UART converter
+       Changed SD-MUX power supply switching circuitry (MOS -> PNP)
+       Removed one connector (TS side) for microSD flat cable