Merge pull request #2196 from aciidb0mb3r/hm

Bring swift-5.1-branch up-to-date with master

Author: aciidgh

Documentation/Development.md

@@ -63,6 +63,8 @@ using a [snapshot](https://swift.org/download/#releases) from swift.org.
 	$ cd swiftpm
 	$ Utilities/bootstrap
 	```
+
+    Note: The bootstrap script requires having [CMake](https://cmake.org/) and [Ninja](https://ninja-build.org/) installed. Please refer to the [Swift project repo](https://github.com/apple/swift/blob/master/README.md#macos) for installation instructions.
 
     This command will build the Package Manager inside `.build/` directory.
     Run the bootstrap script to rebuild after making a change to the source