Update upgrade-description files.

wiki/src/upgrade/v1/Tails/1.5.1/i386/stable/upgrades.yml

@@ -3,3 +3,18 @@ build-target: i386
 channel: stable
 product-name: Tails
 product-version: 1.5.1
+upgrades:
+- details-url: https://tails.boum.org/news/version_1.6/
+  type: major
+  upgrade-paths:
+  - target-files:
+    - sha256: 6daba429ec9372af0822d8dd4c3e96407240a31c9373173a5985d8d669ea1d00
+      size: 987033600
+      url: http://dl.amnesia.boum.org/tails/stable/tails-i386-1.6/tails-i386-1.6.iso
+    type: full
+  - target-files:
+    - sha256: 87fe746e1856713dc4df5ca49d4131f30fb67f6402c80373148315444f5da1c8
+      size: 110510080
+      url: http://dl.amnesia.boum.org/tails/stable/iuk/Tails_i386_1.5.1_to_1.6.iuk
+    type: incremental
+  version: '1.6'

wiki/src/upgrade/v1/Tails/1.5.1/i386/stable/upgrades.yml.pgp

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