Update Travis to test on latest dev SDK release (#1309)

diff --git a/.travis.yml b/.travis.yml
index d81894b..1b720b4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,44 +13,44 @@
 jobs:
   include:
     - stage: analyze_and_format
-      name: "SDK: preview/raw/2.10.0-0.2-dev; PKGS: pkgs/test, pkgs/test_api, pkgs/test_core; TASKS: [`dartfmt -n --set-exit-if-changed .`, `dartanalyzer --enable-experiment=non-nullable --fatal-infos --fatal-warnings .`]"
-      dart: "preview/raw/2.10.0-0.2-dev"
+      name: "SDK: dev; PKGS: pkgs/test, pkgs/test_api, pkgs/test_core; TASKS: [`dartfmt -n --set-exit-if-changed .`, `dartanalyzer --enable-experiment=non-nullable --fatal-infos --fatal-warnings .`]"
+      dart: dev
       os: linux
       env: PKGS="pkgs/test pkgs/test_api pkgs/test_core"
       script: ./tool/travis.sh dartfmt dartanalyzer
     - stage: unit_test
-      name: "SDK: preview/raw/2.10.0-0.2-dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 0`"
-      dart: "preview/raw/2.10.0-0.2-dev"
+      name: "SDK: dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 0`"
+      dart: dev
       os: linux
       env: PKGS="pkgs/test"
       script: ./tool/travis.sh command_0
     - stage: unit_test
-      name: "SDK: preview/raw/2.10.0-0.2-dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 1`"
-      dart: "preview/raw/2.10.0-0.2-dev"
+      name: "SDK: dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 1`"
+      dart: dev
       os: linux
       env: PKGS="pkgs/test"
       script: ./tool/travis.sh command_1
     - stage: unit_test
-      name: "SDK: preview/raw/2.10.0-0.2-dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 2`"
-      dart: "preview/raw/2.10.0-0.2-dev"
+      name: "SDK: dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 2`"
+      dart: dev
       os: linux
       env: PKGS="pkgs/test"
       script: ./tool/travis.sh command_2
     - stage: unit_test
-      name: "SDK: preview/raw/2.10.0-0.2-dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 3`"
-      dart: "preview/raw/2.10.0-0.2-dev"
+      name: "SDK: dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 3`"
+      dart: dev
       os: linux
       env: PKGS="pkgs/test"
       script: ./tool/travis.sh command_3
     - stage: unit_test
-      name: "SDK: preview/raw/2.10.0-0.2-dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 4`"
-      dart: "preview/raw/2.10.0-0.2-dev"
+      name: "SDK: dev; PKG: pkgs/test; TASKS: `xvfb-run -s \"-screen 0 1024x768x24\" pub run --enable-experiment=non-nullable test --preset travis -x phantomjs -x node --total-shards 5 --shard-index 4`"
+      dart: dev
       os: linux
       env: PKGS="pkgs/test"
       script: ./tool/travis.sh command_4
     - stage: unit_test
-      name: "SDK: preview/raw/2.10.0-0.2-dev; PKG: pkgs/test_api; TASKS: `pub run --enable-experiment=non-nullable test --preset travis -x browser`"
-      dart: "preview/raw/2.10.0-0.2-dev"
+      name: "SDK: dev; PKG: pkgs/test_api; TASKS: `pub run --enable-experiment=non-nullable test --preset travis -x browser`"
+      dart: dev
       os: linux
       env: PKGS="pkgs/test_api"
       script: ./tool/travis.sh command_5
diff --git a/pkgs/test/mono_pkg.yaml b/pkgs/test/mono_pkg.yaml
index 6293636..2f5c812 100644
--- a/pkgs/test/mono_pkg.yaml
+++ b/pkgs/test/mono_pkg.yaml
@@ -1,5 +1,5 @@
 dart:
-  - preview/raw/2.10.0-0.2-dev
+  - dev
 
 stages:
     - analyze_and_format:
diff --git a/pkgs/test_api/mono_pkg.yaml b/pkgs/test_api/mono_pkg.yaml
index 4fc50f0..c3e2834 100644
--- a/pkgs/test_api/mono_pkg.yaml
+++ b/pkgs/test_api/mono_pkg.yaml
@@ -1,5 +1,5 @@
-dart: 
-  - preview/raw/2.10.0-0.2-dev
+dart:
+  - dev
 
 stages:
   - analyze_and_format:
diff --git a/pkgs/test_core/mono_pkg.yaml b/pkgs/test_core/mono_pkg.yaml
index 9862f75..15b2c8e 100644
--- a/pkgs/test_core/mono_pkg.yaml
+++ b/pkgs/test_core/mono_pkg.yaml
@@ -1,5 +1,5 @@
 dart:
-  - preview/raw/2.10.0-0.2-dev
+  - dev
 
 stages:
   - analyze_and_format: