Set etherpad changes to .env file

setup.py

@@ -55,10 +55,13 @@ def setup_jitsi():
     os.system('cp jitsi-auto-config/jitsi.subdomain.conf reverse_proxy/nginx/proxy-confs/'+ jitsi_subdomain + '.subdomain.conf')
 
 def setup_etherpad():
-    f = open('.env')
+    f = open('.env', 'rt')
     data = f.read()
     f.close()
     data.replace('#ETHERPAD_URL_BASE=http://etherpad.meet.jitsi:9001', 'ETHERPAD_URL_BASE=http://etherpad:9001')
+    f = open('.env', w)
+    f.write(data)
+    f.close()
 
 if __name__ == '__main__':
     configure_swag()