raindrops: include edge cases where number was the 3rd, 5th or 7th power of something, but did not necessarily have 3, 5 or 7 as a factor

Author: Eileen McFarland

exercises/raindrops/canonical-data.json

@@ -21,7 +21,11 @@
          "expected": "Pling"
       },
       {
-         "number" : 9, 
+        "number" : 8,
+        "expected": "8"
+      }
+      {
+         "number" : 9,
          "expected": "Pling"
       },
       {
@@ -59,6 +63,10 @@
       {
          "number" : 105, 
          "expected": "PlingPlangPlong"
+      },
+      {
+        "number" : 3125,
+        "expected": "Plang"
       }
    ]
 }