Add Sheshi Kham (kip) (#365)

It has been used on translatewiki since 2017,
but was never added to language-data, so it's finally
fixed now.

data/langdb.yaml

@@ -375,6 +375,7 @@ languages:
   khk: [mn]
   khw: [Arab, [ME, AS], کھوار]
   ki: [Latn, [AF], Gĩkũyũ]
+  kip: [Deva, [AS], शेषी पाङ]
   kiu: [Latn, [EU, ME], Kırmancki]
   kj: [Latn, [AF], Kwanyama]
   kjh: [Cyrl, [AS], хакас]

data/language-data.json

@@ -2337,6 +2337,13 @@
             ],
             "Gĩkũyũ"
         ],
+        "kip": [
+            "Deva",
+            [
+                "AS"
+            ],
+            "शेषी पाङ"
+        ],
         "kiu": [
             "Latn",
             [