title: flutter firebase version solving failed
body: <p>Because firebase_storage >=2.0.0 depends on firebase_core ^0.3.0 and firebase_auth 0.6.6 depends on firebase_core ^0.2.5+1, firebase_storage >=2.0.0 is incompatible with firebase_auth 0.6.6.
  And because no versions of firebase_auth match >0.6.6 &lt;0.7.0, firebase_storage >=2.0.0 is incompatible with firebase_auth ^0.6.6.
  So, because store_manager_erp_next depends on both firebase_auth ^0.6.6 and firebase_storage ^2.1.0+1, version solving failed.</p>
  
  <p><br>I am new in flutter, please help me to solve this issue</p>
  
  <pre><code>banner: ^0.1.3
    cloud_firestore: ^0.8.2  
  
    http: ^0.12.0
      # The following adds the Cupertino Icons font to your application.
    # Use with the CupertinoIcons class for iOS style icons.
    cupertino_icons: ^0.1.2
    #sqflite: any
    sqflite: ^0.13.0+1
    folding_cell: "^0.1.0"
    flutter_rating: ^0.0.2
    firebase_auth:  ^0.6.6
    firebase_database: ^1.0.5 
    firebase_storage: ^2.1.0+1
    fluttertoast: ^2.1.5
    progress_hud: ^1.1.0
    auto_size_text: ^0.3.0
    mongo_dart: ^0.3.4
    google_sign_in: ^3.0.4
    material_search: ^0.2.8
    flutter_secure_storage: ^3.1.2
    modal_progress_hud: ^0.1.2
    flutter_typeahead: ^0.4.1
   # flutter_facebook_login: ^1.1.1
    flutter_firebase_ui: ^0.0.13
    json_serializable: ^2.0.1
    flutter_spinkit: "^3.1.0"
    shared_preferences: ^0.4.3
    flutter_html: ^0.8.2
    #pinch_zoom_image: "^0.2.5"
    #photo_view: ^0.2.0
    splashscreen: ^1.1.0
    #shared_preferences: ^0.4.3
    badges: ^0.0.6
  </code></pre>