Log Message:
mate-sensors-applet: Update to 1.20.1.

Changes since 1.18.2:

### mate-sensors-applet 1.20.1

  * Translations update
  * fix save order of sensors v2
  * prefs-dialog: drop unneeded space in general tab
  * prefs-dialog: set a min_width for enable_column
  * prefs-dialog: use hscrollbar-policy GTK_POLICY_NEVER

### mate-sensors-applet 1.20.0

  * require GTK+ 3.22 and GLib 2.50
  * build: enable udisk2 plugin again
  * Translations update
  * Remove deprecated udisks plugin
  * udisks plugin: fix memory management for GValue variables
  * Remove deprecated eee plugin
  * Fix popup shower on removed HDD
  * ibm-acpi.c: Fix build warning:
  * eee-plugin.c: Fix build warning:
  * active-sensor.c: Fix build warning:
  * sensors-applet.c: Fix build warning:
  * update copyright year to 2018
  * Fix indents
  * Fix project cleanup

### mate-sensors-applet 1.19.1

  * Translations update
  * Stop jumping applet as numbers change
  * fix save order of sensors
  * updated hide temperature units
  * remove code duplication

### mate-sensors-applet 1.19.0

  * Translations update
  * sensor-applet.c: replace deprecated GtkMisc
  * sensor-applet.c: avoid deprecated GTK_STOCK_MISSING_IMAGE
  * sensor-config-dialog: avoid deprecated GtkAlignment
  * sensor-config-dialog: don't use deprecated GtkColorButton
  * prefs-dialog: add style class frame to scrolledwindow
  * prefs-dialog: avoid deprecated GtkAlignment
  * prefs-dialog: avoid deprecated GTK_VBUTTON_BOX, GTK_TYPE_{H,V}BOX
  * use GTK_ALIGN_CENTER for the sensor_applet grid