Corrected playground property name.
Corrected playground property name.

markel-kalugin/hopster-test-task,markel-kalugin/hopster-test-task,wstoettinger/appengine-try-python-flask,wstoettinger/appengine-try-python-flask,joaoarthurbm/ciframe,johnbryan/jbryanOrg,hudie8655/google,joaoarthurbm/ciframe,joaoarthurbm/ciframe,johnbryan/jbryanOrg,jinziqi/balance,joaoarthurbm/ciframe,joaoarthurbm/ciframe,googlearchive/appengine-try-python-flask,drxzcl/iot_testbed,googlearchive/appengine-try-python-flask,n1vlac/appengine-try-python-flask,jinziqi/balance,johnbryan/jbryanOrg,b0204888100/chen3,AdvancedTopicsOfSE/aatserver,drxzcl/iot_testbed,hudie8655/google,AdvancedTopicsOfSE/aatserver,joaoarthurbm/ciframe,n1vlac/appengine-try-python-flask,DongjinChoi/blue-air,b0204888100/chen3,DongjinChoi/blue-air,drxzcl/iot_testbed,markel-kalugin/hopster-test-task