Demo docs: clarify that PowerShell requires the values to be double-quoted (#163)

Update demo.rst

https://forum.uavcan.org/t/error-in-pyuavcan-demo/1185/6
diff --git a/docs/pages/demo.rst b/docs/pages/demo.rst
index aae7d9d..7a95e84 100644
--- a/docs/pages/demo.rst
+++ b/docs/pages/demo.rst
@@ -103,7 +103,8 @@
 
     python demo_app.py                                   # Run the application!
 
-The snippet is valid for sh/bash/zsh; if you are using PowerShell on Windows, replace ``export`` with ``$env:``.
+The snippet is valid for sh/bash/zsh; if you are using PowerShell on Windows, replace ``export`` with ``$env:``
+and take values into double quotes.
 Further snippets will not include this remark.
 
 An environment variable ``UAVCAN__SUB__TEMPERATURE_SETPOINT__ID`` sets register ``uavcan.sub.temperature_setpoint.id``,
diff --git a/pyuavcan/VERSION b/pyuavcan/VERSION
index 23aa839..0495c4a 100644
--- a/pyuavcan/VERSION
+++ b/pyuavcan/VERSION
@@ -1 +1 @@
-1.2.2
+1.2.3