Travis: Use " instead of 's (they seem to be reserved)

.travis.yml

@@ -33,7 +33,7 @@ install:
   - cd jdks
   - ./download-jdks.sh
   - cd ../
-  - '[ -z "$TRAVIS_TAG" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && ant -Dstorepass="$NBM_SIGN_PASS" hudson-nightly | awk \'{printf("."); fflush(stdout)}\' || :'
+  - '[ -z "$TRAVIS_TAG" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && ant -Dstorepass="$NBM_SIGN_PASS" hudson-nightly | awk "{printf(\".\"); fflush(stdout)}" || :'
   - '[ -z "$TRAVIS_TAG" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && scp -rp -i nbproject/private/www-updater.key build/updates/* [email protected]:/var/www/updates/nightly/3.1/plugins || :'
   
 #script: