fix: upgrade example deps (#78)

Author: CodingAleCR

example/pubspec.lock

@@ -43,13 +43,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.15.0"
-  cupertino_icons:
-    dependency: "direct main"
-    description:
-      name: cupertino_icons
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.1.2"
   fake_async:
     dependency: transitive
     description:
@@ -73,14 +66,14 @@ packages:
       name: http
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.0"
+    version: "0.13.3"
   http_interceptor:
     dependency: "direct main"
     description:
       path: ".."
       relative: true
     source: path
-    version: "0.4.1"
+    version: "1.0.0"
   http_parser:
     dependency: transitive
     description:

example/pubspec.yaml

@@ -4,12 +4,11 @@ version: 0.0.1+1
 publish_to: "none"
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter:
     sdk: flutter
-  cupertino_icons: ^0.1.2
   http_interceptor:
     path: ../