add wtfismyip source

pddnsc/sources/wtfismyip.py

@@ -0,0 +1,20 @@
+import httpx
+
+from pddnsc.base import BaseSourceProvider
+
+# https://wtfismyip.com/
+# https://gitlab.com/wtfismyip/wtfismyip
+class WTFIsMyIP(BaseSourceProvider):
+    async def fetch_v4(self) -> str:
+        async with httpx.AsyncClient(transport=self.ipv4t) as client:
+            response = await client.get("https://text.ipv4.myip.wtf")
+            if response.is_success:
+                result = response.text.strip() or None
+        return result
+
+    async def fetch_v6(self) -> str:
+        async with httpx.AsyncClient(transport=self.ipv6t) as client:
+            response = await client.get("https://text.ipv6.myip.wtf")
+            if response.is_success:
+                result = response.text.strip() or None
+        return result