pub upgrade (#581)

diff --git a/pubspec.lock b/pubspec.lock
index 0fcb15c..989e3dd 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -91,7 +91,7 @@
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.10"
+    version: "1.3.11"
   build_runner:
     dependency: "direct dev"
     description:
@@ -147,14 +147,14 @@
       name: code_builder
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.4.0"
+    version: "3.4.1"
   codemirror:
     dependency: "direct dev"
     description:
       name: codemirror
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.5.19+5.56.0"
+    version: "0.5.20+5.57.0"
   collection:
     dependency: transitive
     description:
@@ -364,7 +364,7 @@
       name: mime
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.6+3"
+    version: "0.9.7"
   mock_request:
     dependency: "direct dev"
     description:
@@ -455,7 +455,7 @@
       name: shelf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.7.7"
+    version: "0.7.9"
   shelf_packages_handler:
     dependency: transitive
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index aee9427..6388a1d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,7 +6,8 @@
   sdk: ^2.9.2
 
 dependencies:
-  analyzer: ^0.39.15
+  # TODO(domesticmouse): unpin analyzer after we update to Dart 2.10
+  analyzer: 0.39.16
   analysis_server_lib: ^0.1.4
   appengine: ^0.12.0
   args: ^1.5.2