Merge pull request #1638 from ychin/sparkle-force-verify-update-and-appcast-feed

Force Sparkle updater to always verify update and to use signed appcast

Author: ychin

src/MacVim/Info.plist

@@ -1311,6 +1311,10 @@
 	</array>
 	<key>MMWhatsNewURL</key>
 	<string>https://macvim.org/release-notes/whatsnew.html</string>
+	<key>SUVerifyUpdateBeforeExtraction</key>
+	<string>YES</string>
+	<key>SURequireSignedFeed</key>
+	<string>YES</string>
 	<key>SUEnableJavaScript</key>
 	<string>YES</string>
 	<key>SUFeedURL</key>