Update notebooks from 3.0.2 to 3.1 (#141619)

Casks/notebooks.rb

@@ -1,6 +1,6 @@
 cask "notebooks" do
-  version "3.0.2,225"
-  sha256 "d3630fd9b8a2d9578373b58ec2cd762613a2fb8cdcf430d3eadec8e3a36a6d2f"
+  version "3.1"
+  sha256 "34bb68a4b0395340e4d4f0275b494b2798db5ac86bebc310d7408295ba8e746b"
 
   url "https://www.notebooksapp.com/Download/macOS/v#{version.major}/Notebooks.dmg"
   name "Notebooks"
@@ -9,8 +9,10 @@ cask "notebooks" do
 
   livecheck do
     url "https://notebooksapp.com/Download/macOS/v#{version.major}/Notebooks#{version.major}Appcast.xml"
-    strategy :sparkle
+    strategy :sparkle, &:short_version
   end
 
+  depends_on macos: ">= :sierra"
+
   app "Notebooks.app"
 end