Sqflite adapter SDK update and example update

[jaumard]

https://github.com/jaguar-orm/sqflite is broken with last sqflite adapter (master)

Also now that flutter beta has a new version with dart 2 stable, the adapter need to update his environment to be usable in new flutter version

@tejainece can you help on this ? I'm stuck with a crash in the generator :( The getter 'type' was called on null. on many to many example

[tejainece]

Does this occur with https://github.com/jaguar-orm/sqflite

[jaumard]

Yes :)

[tejainece]

I have no time today. Will try to fix it tomorrow.

[jaumard]

No problem @tejainece can't manage to find where is the problem here ^^

[tejainece]

This I think is fixed? Please reopen if the problem still exists.