useless migration of dummy example project.

example/pubspec.lock

@@ -21,7 +21,7 @@ packages:
       name: args
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.0"
+    version: "2.1.0"
   charcode:
     dependency: transitive
     description:
@@ -49,7 +49,7 @@ packages:
       name: convert
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
+    version: "3.0.0"
   crypto:
     dependency: transitive
     description:
@@ -119,7 +119,7 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.9"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
@@ -140,14 +140,14 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.2"
+    version: "1.11.0"
   petitparser:
     dependency: transitive
     description:
       name: petitparser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.0"
+    version: "4.1.0"
   pointycastle:
     dependency: transitive
     description:
@@ -161,7 +161,7 @@ packages:
       name: quiver
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.3"
+    version: "3.0.1"
   source_span:
     dependency: transitive
     description:
@@ -175,7 +175,7 @@ packages:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.5"
+    version: "1.10.0"
   string_scanner:
     dependency: transitive
     description:
@@ -224,6 +224,6 @@ packages:
       name: xml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.4.1"
+    version: "5.1.1"
 sdks:
   dart: ">=2.12.0 <3.0.0"

example/pubspec.yaml

@@ -4,7 +4,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.2.2 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies: