Update dependencies

Author: sunderee

pubspec.yaml

@@ -4,16 +4,16 @@ publish_to: "none"
 version: 1.0.21
 
 environment:
-  sdk: ">=2.18.6"
+  sdk: ">=2.19.2"
 
 dependencies:
   path: ^1.8.3
   directed_graph: ^0.3.7
-  collection: ^1.17.0
+  collection: ^1.17.1
   more: ^3.9.5
   equatable: ^2.0.5
-  meta: ^1.8.0
+  meta: ^1.9.0
 
 dev_dependencies:
   lints: ^2.0.1
-  test: ^1.22.1
+  test: ^1.23.1