Update package.json & add brain-progression game demo run to readme

Author: thedoorbell

README.md

@@ -15,3 +15,7 @@
 ### brain-gcd demo run
 
 <https://asciinema.org/a/8BwBf9NXrmHYz8WeA9PxtH6cG>
+
+### brain-progression demo run
+
+<https://asciinema.org/a/LdlB7cfOqpX71kSFGGC6Vn8fq>

package.json

@@ -21,7 +21,8 @@
     "brain-games": "bin/brain-games.js",
     "brain-even": "bin/brain-even.js",
     "brain-calc": "bin/brain-calc.js",
-    "brain-gcd": "bin/brain-gcd.js"
+    "brain-gcd": "bin/brain-gcd.js",
+    "brain-progression": "bin/brain-progression.js"
   },
   "dependencies": {
     "readline-sync": "^1.4.10"