feat: adds show-time flag for unclassified langs

- Adds hardcoded defaults for envars
- Updates default commit message
- Uses __slots__ for constants

action.yml

@@ -24,7 +24,7 @@ inputs:
 
   COMMIT_MESSAGE:
     description: "Add a commit message of your choice"
-    default: "Updated the Graph with new Metrics"
+    default: "Updated WakaReadme graph with new metrics"
     required: false
 
   # content tweaks
@@ -54,6 +54,11 @@ inputs:
     default: "false"
     required: false
 
+  SHOW_MASKED_TIME:
+    description: "Displays total coding time including unclassified languages"
+    default: "false"
+    required: false
+
 runs:
   using: "docker"
   image: "Dockerfile"