Upgrade to Dart 2.7 (#645)

* Add changelog entry for 3.3.5

Author: domesticmouse

.travis.yml

@@ -9,7 +9,7 @@ dart:
   # SDK version to prevent errors when using Stagehand from inside VSCode's
   # Dart and Flutter plugins. For more detail, please see:
   # https://github.com/dart-lang/stagehand/issues/617
-  - 2.5.0
+  - 2.7.0
   - dev
 
 cache:

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 3.3.5
+
+- Updated minimum Dart SDK to 2.7 in stagehand tool and templates.
+
 ## 3.3.5-dev
 
 - Internal cleanup.

lib/src/generators/console_full.g.dart

@@ -7,7 +7,7 @@ description: >
   A scaffolding generator for your Dart projects. Stagehand helps you get set
   up!
 # After changing the version, run `pub run build_runner build`.
-version: 3.3.5-dev
+version: 3.3.5
 homepage: https://github.com/dart-lang/stagehand
 
 environment:
@@ -17,7 +17,7 @@ environment:
   # https://github.com/dart-lang/stagehand/issues/617
   #
   # Also make sure this minimmum sdk version is reflected in `.travis.yml`.
-  sdk: '>=2.5.0 <3.0.0'
+  sdk: '>=2.7.0 <3.0.0'
 
 # Add the bin/stagehand.dart script to the scripts pub installs.
 executables:
@@ -27,7 +27,7 @@ dependencies:
   args: ^1.5.0
   http: ^0.12.0
   path: ^1.6.0
-  pedantic: ^1.8.0
+  pedantic: ^1.9.0
   usage: ^3.4.0
 
 dev_dependencies: