Replace screenshot URLs for Pushpin (#2048)

Author: dkhamsing

contents.json

@@ -32790,10 +32790,10 @@
         "objc"
       ],
       "screenshots": [
-        "https://camo.githubusercontent.com/ee9665d8adf0fb6007d274f58bc8ad6fb96e5781b1e5e0f92eb75924e0f7fb1c/68747470733a2f2f323031372e6c696f6e686561727473772e636f6d2f7374617469632f696d616765732f7075736870696e2d312e706e67",
-        "https://camo.githubusercontent.com/f201929ac7e7faff2a9dc6138d4006e9cb818030896d90862e827042511c58ec/68747470733a2f2f323031372e6c696f6e686561727473772e636f6d2f7374617469632f696d616765732f7075736870696e2d322e706e67",
-        "https://camo.githubusercontent.com/e6abdd17ee52245c1e7d6e91bf9437d0534699b5ce148b9c41f707d07299b84d/68747470733a2f2f323031372e6c696f6e686561727473772e636f6d2f7374617469632f696d616765732f7075736870696e2d332e706e67",
-        "https://camo.githubusercontent.com/a53adf40cb03fb25a7a9bb4d401061593fc2554ccd944c1ffbe8379eee3acdc4/68747470733a2f2f323031372e6c696f6e686561727473772e636f6d2f7374617469632f696d616765732f7075736870696e2d342e706e67"
+        "https://2017.lionheartsw.com/static/images/pushpin-1.png",
+        "https://2017.lionheartsw.com/static/images/pushpin-2.png",
+        "https://2017.lionheartsw.com/static/images/pushpin-3.png",
+        "https://2017.lionheartsw.com/static/images/pushpin-4.png"
       ],
       "description": "A client for the Pinboard.in bookmarking service",
       "source": "https://github.com/lionheart/Pushpin",