Realmのテーブル構造（モデルクラス）変更について
AndroidRealm0.83.1
RealmRealm
Realm`alter table`
io.realm.exceptions.RealmMigrationNeededException: RealmMigration must be provided
at io.realm.BaseRealm.migrateRealm(BaseRealm.java:568)
at io.realm.Realm.migrateRealm(Realm.java:1064)
at io.realm.Realm.migrateRealm(Realm.java:1053)
at io.realm.Realm.create(Realm.java:253)
at io.realm.Realm.getInstance(Realm.java:219)
at io.realm.Realm.getInstance(Realm.java:182)