add: Add python3

Author: WhiteHyun

scripts/languages.bash

@@ -4,6 +4,7 @@ declare -A language_extensions=(
   ["cpp"]="cpp"
   ["java"]="java"
   ["python"]="py"
+  ["python3"]="py"
   ["c"]="c"
   ["csharp"]="cs"
   ["javascript"]="js"
@@ -25,12 +26,13 @@ declare -A language_comments=(
   ["cpp"]="// "
   ["java"]="// "
   ["python"]="# "
+  ["python3"]="# "
   ["c"]="// "
   ["csharp"]="// "
   ["javascript"]="// "
   ["typescript"]="// "
   ["php"]="// "
-  ["swift"]="// "
+  ["swift"]="//  "
   ["kotlin"]="// "
   ["dart"]="// "
   ["go"]="// "