Merge branch 'master' into master

.github/CODEOWNERS

@@ -0,0 +1,4 @@
+# See https://help.github.com/articles/about-codeowners/
+# for more info about CODEOWNERS file
+
+*       @urfave/cli

CHANGELOG.md

@@ -4,7 +4,28 @@
 
 ## [Unreleased]
 
-## 1.20.0 - 2017-08-10
+## [1.21.0] - 2019-08-02
+
+### Fixed
+
+* Fix using "slice" flag types with `EnvVar` in [urfave/cli/pull/687](https://github.com/urfave/cli/pull/687) via [@joshuarubin](https://github.com/joshuarubin)
+* Fix regression of `SkipFlagParsing` behavior in [urfave/cli/pull/697](https://github.com/urfave/cli/pull/697) via [@jszwedko](https://github.com/jszwedko)
+* Fix handling `ShortOptions` and `SkipArgReorder` in [urfave/cli/pull/686](https://github.com/urfave/cli/pull/686) via [@baude](https://github.com/baude)
+* Fix args reordering when bool flags are present in [urfave/cli/pull/712](https://github.com/urfave/cli/pull/712) via [@windler](https://github.com/windler)
+* Fix parsing of short options in [urfave/cli/pull/758](https://github.com/urfave/cli/pull/758) via [@vrothberg](https://github.com/vrothberg)
+
+### Added / Changed
+
+* Added _"required flags"_ support in [urfave/cli/pull/819](https://github.com/urfave/cli/pull/819) via [@lynncyrin](https://github.com/lynncyrin/)
+* Cleaned up help output in [urfave/cli/pull/664](https://github.com/urfave/cli/pull/664) via [@maguro](https://github.com/maguro)
+* Case is now considered when sorting strings in [urfave/cli/pull/676](https://github.com/urfave/cli/pull/676) via [@rliebz](https://github.com/rliebz)
+* Backport JSON `InputSource` to v1 in [urfave/cli/pull/598](https://github.com/urfave/cli/pull/598) via [@jszwedko](https://github.com/jszwedko)
+* Allow more customization of flag help strings in [urfave/cli/pull/661](https://github.com/urfave/cli/pull/661) via [@rliebz](https://github.com/rliebz)
+* Allow custom `ExitError` handler function in [urfave/cli/pull/628](https://github.com/urfave/cli/pull/628) via [@phinnaeus](https://github.com/phinnaeus)
+* Allow loading a variable from a file in [urfave/cli/pull/675](https://github.com/urfave/cli/pull/675) via [@jmccann](https://github.com/jmccann)
+* Allow combining short bool names in [urfave/cli/pull/684](https://github.com/urfave/cli/pull/684) via [@baude](https://github.com/baude)
+
+## [1.20.0] - 2017-08-10
 
 ### Fixed
 
@@ -407,7 +428,11 @@ signature of `func(*cli.Context) error`, as defined by `cli.ActionFunc`.
 ### Added
 - Initial implementation.
 
-[Unreleased]: https://github.com/urfave/cli/compare/v1.18.0...HEAD
+[Unreleased]: https://github.com/urfave/cli/compare/v1.21.0...HEAD
+[1.21.0]: https://github.com/urfave/cli/compare/v1.20.0...v1.21.0
+[1.20.0]: https://github.com/urfave/cli/compare/v1.19.1...v1.20.0
+[1.19.1]: https://github.com/urfave/cli/compare/v1.19.0...v1.19.1
+[1.19.0]: https://github.com/urfave/cli/compare/v1.18.0...v1.19.0
 [1.18.0]: https://github.com/urfave/cli/compare/v1.17.0...v1.18.0
 [1.17.0]: https://github.com/urfave/cli/compare/v1.16.0...v1.17.0
 [1.16.0]: https://github.com/urfave/cli/compare/v1.15.0...v1.16.0

CONTRIBUTING.md

@@ -1,11 +1,10 @@
 ## Contributing
 
-**NOTE**: the primary maintainer(s) may be found in
-[./MAINTAINERS.md](./MAINTAINERS.md).
+Use @urfave/cli to ping the maintainers.
 
-Feel free to put up a pull request to fix a bug or maybe add a feature. I will
+Feel free to put up a pull request to fix a bug or maybe add a feature. We will
 give it a code review and make sure that it does not break backwards
-compatibility. If I or any other collaborators agree that it is in line with
+compatibility. If collaborators agree that it is in line with
 the vision of the project, we will work with you to get the code into
 a mergeable state and merge it into the master branch.
 
@@ -15,5 +14,5 @@ to merge others pull requests. It is very important that new code does not
 break existing code, so be careful about what code you do choose to merge.
 
 If you feel like you have contributed to the project but have not yet been added
-as a collaborator, we probably forgot to add you :sweat_smile:.  Please open an
+as a collaborator, we probably forgot to add you :sweat_smile:. Please open an
 issue!

README.md

@@ -679,6 +679,7 @@ from other file input sources.
 
 Currently supported input source formats:
 * YAML
+* JSON
 * TOML
 
 In order to get values for a flag from an alternate input source the following
@@ -701,7 +702,7 @@ the yaml input source for any flags that are defined on that command.  As a note
 the "load" flag used would also have to be defined on the command flags in order
 for this code snipped to work.
 
-Currently only YAML and JSON files are supported but developers can add support
+Currently only YAML, JSON, and TOML files are supported but developers can add support
 for other input sources by implementing the altsrc.InputSourceContext for their
 given sources.