Fix test related to latest version of source_span (dart-lang/pubspec_parse#55)

Bump min SDK to ensure tested SDKs support latest source_span
Cleanup analysis_options.yaml
diff --git a/pkgs/pubspec_parse/.travis.yml b/pkgs/pubspec_parse/.travis.yml
index ccb1caf..66bff3d 100644
--- a/pkgs/pubspec_parse/.travis.yml
+++ b/pkgs/pubspec_parse/.travis.yml
@@ -1,7 +1,7 @@
 language: dart
 
 dart:
-  - 2.2.0
+  - 2.6.0
   - dev
 
 dart_task:
@@ -16,7 +16,7 @@
     - dart: dev
       dart_task:
         dartanalyzer: --fatal-infos --fatal-warnings .
-    - dart: 2.2.0
+    - dart: 2.6.0
       dart_task:
         dartanalyzer: --fatal-warnings .
 
diff --git a/pkgs/pubspec_parse/CHANGELOG.md b/pkgs/pubspec_parse/CHANGELOG.md
index f2c2542..df5c0e8 100644
--- a/pkgs/pubspec_parse/CHANGELOG.md
+++ b/pkgs/pubspec_parse/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.6-dev
+
+- Update SDK requirement to `>=2.6.0 <3.0.0`.
+
 ## 0.1.5
 
 - Update SDK requirement to `>=2.2.0 <3.0.0`.
diff --git a/pkgs/pubspec_parse/analysis_options.yaml b/pkgs/pubspec_parse/analysis_options.yaml
index f983bb3..649460a 100644
--- a/pkgs/pubspec_parse/analysis_options.yaml
+++ b/pkgs/pubspec_parse/analysis_options.yaml
@@ -1,13 +1,9 @@
 include: package:pedantic/analysis_options.yaml
+
 analyzer:
   strong-mode:
     implicit-casts: false
-  errors:
-    dead_code: error
-    override_on_non_overriding_method: error
-    unused_element: error
-    unused_import: error
-    unused_local_variable: error
+
 linter:
   rules:
     - always_declare_return_types
diff --git a/pkgs/pubspec_parse/pubspec.yaml b/pkgs/pubspec_parse/pubspec.yaml
index fc54d12..7856305 100644
--- a/pkgs/pubspec_parse/pubspec.yaml
+++ b/pkgs/pubspec_parse/pubspec.yaml
@@ -2,12 +2,12 @@
 description: >-
   Simple package for parsing pubspec.yaml files with a type-safe API and rich
   error reporting.
-version: 0.1.5
+version: 0.1.6-dev
 homepage: https://github.com/dart-lang/pubspec_parse
 author: Dart Team <misc@dartlang.org>
 
 environment:
-  sdk: '>=2.2.0 <3.0.0'
+  sdk: '>=2.6.0 <3.0.0'
 
 dependencies:
   checked_yaml: ^1.0.0
diff --git a/pkgs/pubspec_parse/test/dependency_test.dart b/pkgs/pubspec_parse/test/dependency_test.dart
index d3bf3ad..35ac6b6 100644
--- a/pkgs/pubspec_parse/test/dependency_test.dart
+++ b/pkgs/pubspec_parse/test/dependency_test.dart
@@ -139,10 +139,10 @@
       'not_supported': null
     }, r'''
 line 10, column 4: Unrecognized keys: [not_supported]; supported keys: [sdk, git, path, hosted]
-  ╷
-10│    "not_supported": null
-  │    ^^^^^^^^^^^^^^^
-  ╵''');
+   ╷
+10 │    "not_supported": null
+   │    ^^^^^^^^^^^^^^^
+   ╵''');
   });
 
   test('map w/ version and hosted as String', () {