Update and rename buildozer.spec.txt to buildozer.spec

Author: jaimefgdev

buildozer.spec.txt buildozer.specbuildozer.spec.txt renamed to buildozer.spec

@@ -411,4 +411,4 @@ warn_on_root = 1
 # build_dir = ./.buildozer
 
 # (str) Path to build output (i.e. .apk, .aab, .ipa) storage
-# bin_dir = ./bin
+# bin_dir = ./bin