Add Python 3.13 and 3.14 to the test matrix (#8)

Author: cottsay

strategy.json

@@ -1,6 +1,6 @@
 {
   "matrix": {
     "os": ["macos-latest", "ubuntu-latest", "windows-latest"],
-    "python": ["3.8", "3.9", "3.10", "3.11", "3.12"]
+    "python": ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
   }
 }