Add Bukkit's new `provides` field. (#8)

Commit adding this field: 9f2fd967a4 (src)/main/java/org/bukkit/plugin/PluginDescriptionFile.java

README.md

@@ -49,6 +49,7 @@ bukkit {
     loadBefore = ['BrokenPlugin']
     prefix = 'TEST'
     defaultPermission = 'OP' // 'TRUE', 'FALSE', 'OP' or 'NOT_OP'
+    provides = ['TestPluginOldName', 'TestPlug']
     
     commands {
         test {
@@ -106,6 +107,7 @@ bukkit {
     loadBefore = listOf("BrokenPlugin")
     prefix = "TEST"
     defaultPermission = BukkitPluginDescription.Permission.Default.OP // TRUE, FALSE, OP or NOT_OP
+    provides = listOf("TestPluginOldName", "TestPlug")
     
     commands {
         "test" {

src/main/kotlin/net/minecrell/pluginyml/bukkit/BukkitPlugin.kt

@@ -60,6 +60,10 @@ class BukkitPlugin : PlatformPlugin<BukkitPluginDescription>("Bukkit", "plugin.y
                 if (alias.contains(':')) throw InvalidPluginDescriptionException("Alias '$alias' of '${command.name}' cannot contain ':'")
             }
         }
+
+        if (description.provides?.all(VALID_NAME::matches) == false) {
+            throw InvalidPluginDescriptionException("Invalid plugin provides name: all should match $VALID_NAME")
+        }
     }
 
 }

src/main/kotlin/net/minecrell/pluginyml/bukkit/BukkitPluginDescription.kt

@@ -47,6 +47,7 @@ class BukkitPluginDescription(project: Project) : Serializable {
     @JsonProperty("loadbefore") var loadBefore: List<String>? = null
     var prefix: String? = null
     @JsonProperty("default-permission") var defaultPermission: Permission.Default? = null
+    var provides: List<String>? = null
 
     // DSL provider for commands and permissions (not serialized)
     @Transient @JsonIgnore val commands: NamedDomainObjectContainer<Command> = project.container(Command::class.java)