Disable retryWrites for non-RS sharded cluster on travis-ci

Author: alcaeus

.travis.yml

@@ -93,6 +93,7 @@ jobs:
       php: "7.3"
       env:
         - DEPLOYMENT=SHARDED_CLUSTER
+        - APPEND_URI="/?retryWrites=false"
     - stage: Test
       php: "7.3"
       env:
@@ -134,7 +135,7 @@ before_script:
   - ulimit -c unlimited -S
 
 script:
-  - export MONGODB_URI=`cat /tmp/uri.txt`
+  - export MONGODB_URI=`cat /tmp/uri.txt`$APPEND_URI
   - echo $MONGODB_URI
   - vendor/bin/phpunit -v