* Require Swift 5.3 or higher to build
* Remove Swift Version Support tables from readmes
These weren't exactly accurate because SwiftLint should still work with
older Swift versions long after we update the minimum version of Swift
needed to _build_ the tool. So I doubt this table was very helpful to
anyone.
* Add Example wrapper in order to display test failures inline when running in Xcode.
* Stop using Swift 5.1-only features so we can compile on Xcode 10.2.
* Wrap strings in Example.
* Add Changelog entry.
* Wrap all examples in Example struct.
* Better and more complete capturing of line numbers.
* Fix broken test.
* Better test traceability.
* Address or disable linting warnings.
* Add documentation comments.
* Disable linter for a few cases.
* Limit mutability and add copy-and-mutate utility functions.
* Limit scope of mutability.
* Improve compilation time
Before this change, `trailingClosure` took 8.6s to type check.
After this change, it takes 31ms.
* Speed up type checking `isDecimal(number:)`
Before: 377ms
After: 2ms
* Speed up type checking testViolationMessageForExpressibleByIntegerLiteral()
Before: 285ms
After: 175ms
* Fix OSSCheck
More than just rules are in `Source/SwiftLintFramework/Rules/`
* Shim XCTUnwrap for Swift 5.0
Danny Mösch