Mongo 6 upgrade

[StefanoDeVuono]

Hi @gcollazo et al,

I was upgrading to Mongo 5 and by the time I got that working, version 6 was available. So, here goes:

I made some changes to allow an upgrade to Mongo 5 6.
Overview:

convert to swift 5: I made a small update to Swift 5 syntax
upgrade to mongo 5: Finally I updated the Info.plist and update.sh files.
delete sparkle framework, add sparkle as swift package: I updated Sparkle to version 2 (without changing from the deprecated SUUpdater class)
build working; mongo 6: I fixed the build to work with Sparkle as a Swift package and ran the update.sh script. Lo and behold, we're on Mongo 6

Details:

• convert to swift 5: The Swift syntax change was very small.
• upgrade to mongo 5: The update.sh was changed as mongo's download page has changed slightly. Feel free to test the curl command used to find the most recent version:

 curl -Ls https://www.mongodb.com/download-center/community | \
    grep -o ',[^,]*"current":true,' | \
    head -n 1 | \
    grep -o '[0-9]*\.[0-9]*\.[0-9]*'

The download page format has changed and can no longer be parsed for option tags, I parse the versions are stored in JSON, although there are other solutions (I could try parsing the html and there's a current.json endpoint mongo provides; however, between parsing HTML, JSON within HTML or a JSON endpoint and without being able to guarantee that a user has jq installed, it feels like there's no great solution.)

• delete sparkle framework, add sparkle as swift package: Sparkle is deprecating the SUUpdater class and switching to a new system of deltas. However the current class and system of deltas from Sparkle 1.18 is still supported for now.
  I updated the build target to from 10.9 to 10.11 to support the new version of Sparkle.
• build working; mongo 6: I fixed the build to work with Sparkle as a Swift package and ran the update.sh script. Lo and behold, we're on Mongo 6

[gcollazo]

I will review later in the week. Thanks for the PR.

[gcollazo]

👍 Looks good to me

[gcollazo]

Published: https://gcollazo.github.io/mongodbapp/