fix travis creds

src/travis/svars-write.py

@@ -1,13 +0,0 @@
-import sys
-import json
-import os
-
-cfg = json.load(sys.stdin)
-cfg['client_secret'] = os.getenv('client_secret')
-jid = os.getenv('jid')
-cfg['refresh_token'] = os.getenv('refresh_%s' % jid)
-gampath = os.getenv('gampath')
-out_file = os.path.join(gampath, 'oauth2.txt')
-with open(out_file, 'w') as f:
-    json.dump(cfg, f)
-print(f'Wrote {out_file} with {len(cfg["client_secret"]} char client secret and {len(cfg["refresh_token"])} char refresh token.')