start migrate to null-safety

Author: avdosev

pubspec.yaml

@@ -18,17 +18,17 @@ dependencies:
   intl: "^0.17.0"
   cupertino_icons: ^1.0.2
   http: ">=0.12.0"
-  html: "0.14.0+3"
+  html: "^0.15.0"
   share: ^2.0.1
-  flutter_highlight: "0.6.0"
+  flutter_highlight: "^0.7.0"
   either_dart: ^0.1.3
   flutter_svg: "^0.22.0"
   url_launcher: "^5.6.0"
-  hive: ^1.4.4
-  hive_flutter: ^0.3.1
+  hive: ^2.0.4
+  hive_flutter: ^1.1.0
   flutter_slidable: 0.6.0
   photo_view: ^0.11.1
-  path_provider: ">=1.6.22"
+  path_provider: "^2.0.2"
   crypto: ">=2.1.5"
   provider: ^5.0.0
   itertools: ">=0.1.0"