Dart 2.7.2 (#493)

diff --git a/.travis.yml b/.travis.yml
index 6368198..29a5c1f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@
   - gem install coveralls-lcov
 dart:
   # Keep this value aligned with min SDK value in pubspec.yaml and FROM line of Dockerfile
-  - "2.7.1"
+  - "2.7.2"
   # TODO(devoncarew): commented out due to
   # https://github.com/dart-lang/dart-pad/issues/1002
   #- dev
diff --git a/Dockerfile b/Dockerfile
index 3b1f16c..8730160 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Keep aligned with min SDK in pubspec.yaml and Dart test version in .travis.yml
-FROM google/dart:2.7.1
+FROM google/dart:2.7.2
 
 # The specific commit that dart-services should use. This should be kept
 # in sync with the flutter submodule in the dart-services repo.
diff --git a/pubspec.lock b/pubspec.lock
index 98386d3..afe3ad5 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -695,4 +695,4 @@
     source: hosted
     version: "2.2.0"
 sdks:
-  dart: ">=2.7.1 <3.0.0"
+  dart: ">=2.7.2 <3.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 82fda16..5049351 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -3,7 +3,7 @@
 
 environment:
   # Keep SDK aligned with .travis.yml and FROM line of Dockerfile
-  sdk: ^2.7.1
+  sdk: ^2.7.2
 
 dependencies:
   _discoveryapis_commons: 0.1.9