Fix wrt analyzer tip

pubspec.lock

Index: pubspec.lock
diff --git a/pubspec.lock b/pubspec.lock
index c857bac4e1115cbef00598797e1f02e28eed3268..72a3ce130f989a690d724323060bde885376877c 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -6,7 +6,7 @@ packages:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.27.4-alpha.19"
+    version: "0.27.4"
   args:
     description:
       name: args
@@ -162,7 +162,7 @@ packages:
       name: package_config
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.5"
+    version: "1.0.0"
   package_resolver:
     description:
       name: package_resolver
@@ -205,6 +205,12 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.6.5+2"
+  shelf_packages_handler:
+    description:
+      name: shelf_packages_handler
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
   shelf_static:
     description:
       name: shelf_static
@@ -258,7 +264,7 @@ packages:
       name: test
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.15+1"
+    version: "0.12.15+2"
   typed_data:
     description:
       name: typed_data
@@ -313,4 +319,4 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.10"
-sdk: ">=1.17.0-dev.6.2 <1.20.0"
+sdk: ">=1.17.0-dev.6.2 <2.0.0"