1.0.28/fix publish warnings (#472)

* added licenses

I've just copied the LICENSE file.

* change dependencies at dart/pubspec.yaml

* change dependencies at flutter/pubspec.yaml

Author: fischerscode

packages/dart/pubspec.yaml

@@ -14,7 +14,7 @@ dependencies:
 
   #Database
   sembast: ^2.4.7+6
-  sembast_web: '>=1.0.0'
+  sembast_web: ^1.2.0
   xxtea: ^2.0.3
 
   # Utils

packages/flutter/pubspec.yaml

@@ -13,7 +13,6 @@ dependencies:
   parse_server_sdk: ^1.0.28
 
   # Networking
-  dio: ^3.0.10
   connectivity: ^0.4.9+2 # only used in the flutter part
 
   #Database
@@ -22,7 +21,6 @@ dependencies:
   # Utils
   path_provider: ^1.6.14 # only used in the flutter part
   package_info: ^0.4.3 # only used in the flutter part
-
   sembast: ^2.4.7+6 # required for transitive use only
   path: ^1.7.0 # required for transitive use only