Minor fix. Coverage uses bourne shell, not bash

script/coverage

@@ -27,10 +27,9 @@ export DYN_USERNAME=
 export GOOGLE_APPLICATION_CREDENTIALS=
 
 
-OMIT_PATHS=("octodns/cmds/*"
-            "octodns/provider/transip*.py") # FIXME Transip tests are failing. Omitting them until they are fixed
+OMIT_PATHS="octodns/cmds/*,octodns/provider/transip*.py" # FIXME Transip tests are failing. Omitting them until they are fixed
 
-coverage run --branch --source=octodns --omit=$(echo ${OMIT_PATHS[@]} | tr ' ' ',')  "$(command -v nosetests)" --with-xunit "$@"
+coverage run --branch --source=octodns --omit=${OMIT_PATHS} "$(command -v nosetests)" --with-xunit "$@"
 coverage html
 coverage xml
 coverage report --show-missing