Add Renren (#936)

Color from their official .jpg logo from renren.com
Note that the .jpg is very noisy - as such there are multiple shades of
blue in it. The chosen one is from the biggest consistent area I could
find.
Alternative color choice: #005EAC from the .png logo from Wikipedia

As no official SVG source is available, one was taken from third party
sources. This was verified to match the official .jpg as closely as
possible.

_data/simple-icons.json

@@ -1480,6 +1480,11 @@
             "hex": "764ABC",
             "source": "https://github.com/reactjs/redux/tree/master/logo"
         },
+        {
+            "title": "Renren",
+            "hex": "217DC6",
+            "source": "https://seeklogo.com/vector-logo/184137/renren-inc"
+        },
         {
             "title": "ReverbNation",
             "hex": "E43526",

icons/renren.svg

@@ -0,0 +1 @@
+<svg aria-labelledby="simpleicons-renren-icon" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><title id="simpleicons-renren-icon">Renren icon</title><path d="M5.661 9.601V5.303a6.793 6.793 0 0 0-4.053 11.084c2.378-1.152 4.041-3.755 4.053-6.786zM6.793 13.715c-.423 1.752-1.687 3.249-3.262 4.244a6.759 6.759 0 0 0 3.261.833 6.771 6.771 0 0 0 3.262-.833c-1.575-.995-2.838-2.493-3.261-4.244zM11.977 7.613a6.789 6.789 0 0 0-4.052-2.31v4.265c0 3.044 1.666 5.662 4.051 6.817a6.766 6.766 0 0 1-1.607-4.386 6.754 6.754 0 0 1 1.608-4.386z"/><path d="M11.977 7.613c1.003 1.183 1.655 2.714 1.655 4.387s-.652 3.202-1.655 4.387l-.001-.001.001.001c2.378-1.151 4.087-3.755 4.099-6.786V5.303a6.9 6.9 0 0 0-4.099 2.31zM18.34 9.568c0 3.045 1.666 5.662 4.052 6.818A6.792 6.792 0 0 0 18.34 5.304v4.264zM17.208 13.715c-.423 1.752-1.687 3.249-3.262 4.244a6.759 6.759 0 0 0 3.261.833 6.771 6.771 0 0 0 3.262-.833c-1.574-.995-2.838-2.493-3.261-4.244z"/></svg>