Package dependency updates

Update package dependencies (#323)

* Update package dependencies

* Update github org

Swift 4.x no longer supported

Swift 5.1 is now the minimum supported version.

First community release

To ensure dependencies are tracked properly, you should specify this as the minimum release version going forward.

2.4.0

• fix: Send Basic Auth credentials in an Authorization header (#303)
• feat: Ability to limit request size and connection count (#307)

2.3.0

feat: Allow Kitura-NIO to only listen on one network address (#299). Kitura listens on every available address/interface. This feature allows Kitura to listen on only on interface/network address.

2.2.0

• feat: Add support for Unix domain sockets (#296)

2.1.7

• Disable curl's Expect header (#294): prevents ClientRequest (which uses curl) from sending an Expect: 100-continue header when sending payloads above a certain threshold, as Kitura does not support it (resulting in a 1 second delay for such requests).

2.1.5

• fix: resolve crash on Linux with Swift 5 (#284)

2.1.4

• fix: workaround to pass UInt16 value for ClientRequest.Options (#285) - resolves #275

2.1.3

• fix: Ensure exclusive access (SE-0176) when mutating ClientRequest.delegate (#278)