Prepare to publish analyzer 1.4.0 and _fe_analyzer_shared 20.0.0.

Change-Id: Ifdf4371221776da3ede6c28f2938eb51d19f61da
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/193898
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>

pkg/_fe_analyzer_shared/pubspec.yaml

@@ -1,5 +1,5 @@
 name: _fe_analyzer_shared
-version: 19.0.0
+version: 20.0.0
 description: Logic that is shared between the front_end and analyzer packages.
 homepage: https://github.com/dart-lang/sdk/tree/master/pkg/_fe_analyzer_shared
 

pkg/analyzer/CHANGELOG.md

@@ -1,7 +1,10 @@
-## 1.4.0-dev
+## 1.4.0
 * Deprecated `TypeProvider.nonSubtypableClasses`.
   Use `TypeProvider.isNonSubtypableClass` instead.
 * Added `sdkPath` to `AnalysisContextCollection` constructor.
+* Improved support for generalized type aliases.
+* The feature `nonfunction-type-aliases` is enabled by default in the
+  language version `2.13`.
 
 ## 1.3.0
 * Added `Expression.inConstantContext` to API.

pkg/analyzer/pubspec.yaml

@@ -1,5 +1,5 @@
 name: analyzer
-version: 1.4.0-dev
+version: 1.4.0
 description: This package provides a library that performs static analysis of Dart code.
 homepage: https://github.com/dart-lang/sdk/tree/master/pkg/analyzer
 
@@ -7,7 +7,7 @@ environment:
   sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
-  _fe_analyzer_shared: ^19.0.0
+  _fe_analyzer_shared: ^20.0.0
   cli_util: ^0.3.0
   collection: ^1.15.0
   convert: ^3.0.0