Getting code coverage to only run on master

.travis.yml

@@ -10,14 +10,8 @@ before_script:
   - psql -c "alter user dart with password 'dart';" -U postgres
   - psql -c 'grant all on database dart_test to dart;' -U postgres
   - pub get
-script:
-  - pub run test -j 1 -r expanded
-  - pub global activate -sgit https://github.com/stablekernel/codecov_dart.git
-  - dart_codecov_generator --report-on=lib/ --verbose --no-html
-after_success:
-  - if [ "$TRAVIS_BRANCH" == "master" ]; then
-      bash <(curl -s https://codecov.io/bash)
-    fi
+script: sh ci/script.sh
+after_success: sh ci/after_script.sh
 branches:
   only:
     - master

ci/after_script.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+if [ "$TRAVIS_BRANCH" == "master" ]; then
+  bash <(curl -s https://codecov.io/bash)
+fi

ci/script.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+pub run test -j 1 -r expanded
+if [ "$TRAVIS_BRANCH" == "master" ]; then
+  pub global activate -sgit https://github.com/stablekernel/codecov_dart.git
+  dart_codecov_generator --report-on=lib/ --verbose --no-html
+fi