Update plugin-annotations to 1.13* Add more checks to ensure plugin's are using @Plugin correctly.
* Add no-args constructor check.
* Break up some checks to get better error messages.
* Update error messages to be more informative.
* Update Bukkit version to 1.13
* Bump version
Misc changes for v1.2* Add @ApiVersion and appropriate targets
* Add ability to have @Command and @Permission annotations on classes
that implement CommandExecutor. Thanks Hex for the suggestion.
* Remove last reference to @Main.
* Update README.
* Bump version.
* Remove deprecated annotations.