travis: fix aws config condition

Close #3113

Author: efiop

scripts/ci/install.sh

@@ -14,8 +14,7 @@ $scriptdir/retry.sh pip install .[all,tests]
 git config --global user.email "dvctester@example.com"
 git config --global user.name "DVC Tester"
 
-if [[ "$TRAVIS_PULL_REQUEST" == "false" && \
-      "$TRAVIS_SECURE_ENV_VARS" == "true" ]]; then
+if [[ "$TRAVIS_SECURE_ENV_VARS" == "true" ]]; then
 	aws configure set aws_access_key_id $AWS_ACCESS_KEY_ID
 	aws configure set aws_secret_access_key $AWS_SECRET_ACCESS_KEY
 	aws configure set region us-east-2