Add rule to omit get clause from computed property declarations when …

…unnecessary (airbnb#150)

README.md

@@ -1899,6 +1899,32 @@ _You can enable the following settings in Xcode by running [this script](resourc
 
   </details>
 
+* <a id='redundant-get'></a>(<a href='#redundant-get'>link</a>) **Omit the `get` clause from a computed property declaration that doesn't also have a `set`, `willSet`, or `didSet` clause.** [![SwiftFormat: redundantGet](https://img.shields.io/badge/SwiftFormat-redundantGet-7B0051.svg)](https://github.com/nicklockwood/SwiftFormat/blob/master/Rules.md#redundantGet)
+
+    <details>
+
+    ```swift
+    // WRONG
+    var universe: Universe {
+      get {
+        Universe()
+      }
+    }
+
+    // RIGHT
+    var universe: Universe {
+      Universe()
+    }
+
+    // RIGHT
+    var universe: Universe {
+      get { multiverseService.current }
+      set { multiverseService.current = newValue }
+    }
+    ```
+
+    </details>
+
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 ## File Organization

resources/airbnb.swiftformat

@@ -45,6 +45,7 @@
 --rules redundantSelf
 --rules redundantType
 --rules redundantPattern
+--rules redundantGet
 --rules redundantFileprivate
 --rules redundantRawValues
 --rules sortedImports