update deployment script

.travis.yml

@@ -34,11 +34,14 @@ install:
 script:
   - cd $PROJECT_PATH
   - make firmware
+  - ls -la
 
 deploy:
-  provider: releases
-  api_key: "GITHUB OAUTH TOKEN"
-  file: "FILE TO UPLOAD"
+  - provider: releases
+    api_key: "$GITHUB_TOKEN"
+    file_glob: true
+    file: "nina-fw.bin"
     skip_cleanup: true
+    overwrite: true
     on:
       tags: true