2.0.0

A maintenance release that brings the library up to the current iOS toolchain.
The public API is unchanged — every breaking item below is about how the library
is built and installed.

Migration guide

1. Switch to Swift Package Manager.

CocoaPods and Carthage support is gone. Remove the pod 'RxPullToRefresh' line
from your Podfile or the github "futamura/RxPullToRefresh" line from your
Cartfile, then add the package in Xcode via File > Add Package Dependencies…
with https://github.com/futamura/RxPullToRefresh.git, or in Package.swift:

dependencies: [
    .package(url: "https://github.com/futamura/RxPullToRefresh.git", from: "2.0.0")
]

The CocoaPods trunk only ever carried 0.1.x, which targets Swift 4.2 and no
longer builds on current toolchains. Those versions stay published but receive
no updates.

2. Raise your deployment target to iOS 13.

3. Move to RxSwift 6. If your own code touches RxSwift, the rename that
affects this library's usage patterns is takeUntil(_:) → take(until:).
See the RxSwift 6.0.0 release notes
for the full list.

4. If you subclass UITableViewController, clear the delegate before handing
it to RxCocoa, or RxCocoa's debug assertion will trap:

tableView.delegate = nil
tableView.dataSource = nil
tableView.rx.setDelegate(self).disposed(by: disposeBag)

This was always required; it only surfaced now because release-built dependencies
used to strip the assertion.

Changed

• BREAKING Minimum deployment target raised from iOS 10.0 to iOS 13.0.
• BREAKING RxSwift and RxCocoa dependency raised from 5.x to 6.x.
• BREAKING Minimum Swift version raised from 5.0 to 5.9.
• Documentation is now generated with DocC and published to GitHub Pages on
  every push to master, replacing the jazzy site committed under docs/.

Added

• Swift Package Manager support via Package.swift.
• GitHub Actions workflows for tests, example build, SwiftLint, and docs.

Removed

• BREAKING CocoaPods support (RxPullToRefresh.podspec).
• BREAKING Carthage support (Cartfile and related manifests).
• Travis CI configuration, superseded by GitHub Actions.
• Ruby toolchain (bundler, fastlane, slather), jazzy configuration and theme,
  Hound and Codecov configuration, and assorted helper scripts.

Fixed

• Example app crashed on launch under a debug-built RxCocoa because
  UITableViewController and the storyboard both wired the table view delegate
  before rx.setDelegate(_:) ran.
• Missing UIKit imports in Debug.swift and Enums.swift, which only surfaced
  when building through Swift Package Manager.
• Deprecated UIActivityIndicatorView.Style.gray replaced with .medium.
• Associated object keys no longer take pointers to String variables, which
  exposed the string's internal representation and drew compiler warnings.