Update github example data (#1077)

Updating github example data with support
for 🚀 and 👀 reaction types.

This follows #1068 and @decentralion updating
the archived repo with the new reaction types.

`src/plugins/github/fetchGithubRepoTest.sh -u`
(as @decentralion suggested) updated `example-github.json`

`yarn unit` caught two tests with failing snapshot
tests (`createGraph.test` and `relationalView.test`), so
I updated those with `yarn unit -u`

`yarn test -full` caught a failing snapshot test
at `sharness-full`, resolved by updating the
snapshot in `view.json.gz` with
 `UPDATE_SNAPSHOT=1 yarn test --full`.
Thanks to @wchargin for the [explanation] on how
to resolve that issue.

[explanation]: https://github.com/sourcecred/sourcecred/pull/1077#pullrequestreview-196805017

**Test Plan:**
`yarn test --full` is passing.

Additionally, the commands:
```sh
    filepath="./sharness/__snapshots__/example-github-load/data/sourcecred/example-github/github/view.json.gz" &&
    [ -f "${filepath}" ] &&  # sanity check
    diff -u \
        <(git show "HEAD:${filepath}" | gzip -d | jq .) \
        <(gzip -dc "${filepath}" | jq .) \
        ;
```

yields the following output:

```
--- /dev/fd/63  2019-01-27 08:34:15.020387301 -0500
+++ /dev/fd/62  2019-01-27 08:34:15.021095696 -0500
@@ -654,6 +654,22 @@
               "subtype": "USER",
               "login": "decentralion"
             }
+          },
+          {
+            "content": "ROCKET",
+            "user": {
+              "type": "USERLIKE",
+              "subtype": "USER",
+              "login": "decentralion"
+            }
+          },
+          {
+            "content": "EYES",
+            "user": {
+              "type": "USERLIKE",
+              "subtype": "USER",
+              "login": "decentralion"
+            }
           }
         ]
       }

```

Again, thanks @wchargin's for providing those commands and accompanying
explanation.

src/plugins/github/__snapshots__/createGraph.test.js.snap

@@ -1787,6 +1787,29 @@ Array [
         "dstIndex": 24,
         "srcIndex": 43,
       },
+      Object {
+        "address": Array [
+          "sourcecred",
+          "github",
+          "REACTS",
+          "ROCKET",
+          "5",
+          "sourcecred",
+          "github",
+          "USERLIKE",
+          "USER",
+          "decentralion",
+          "6",
+          "sourcecred",
+          "github",
+          "ISSUE",
+          "sourcecred",
+          "example-github",
+          "13",
+        ],
+        "dstIndex": 29,
+        "srcIndex": 42,
+      },
       Object {
         "address": Array [
           "sourcecred",

src/plugins/github/__snapshots__/relationalView.test.js.snap

@@ -503,6 +503,22 @@ Object {
         "type": "USERLIKE",
       },
     },
+    Object {
+      "content": "ROCKET",
+      "user": Object {
+        "login": "decentralion",
+        "subtype": "USER",
+        "type": "USERLIKE",
+      },
+    },
+    Object {
+      "content": "EYES",
+      "user": Object {
+        "login": "decentralion",
+        "subtype": "USER",
+        "type": "USERLIKE",
+      },
+    },
   ],
   "https://github.com/sourcecred/example-github/pull/5#discussion_r171460198": Array [
     Object {

src/plugins/github/example/example-github.json

@@ -659,6 +659,28 @@
                         "login": "decentralion",
                         "url": "https://github.com/decentralion"
                     }
+                },
+                {
+                    "__typename": "Reaction",
+                    "content": "ROCKET",
+                    "id": "MDg6UmVhY3Rpb24zNTc5ODQzNQ==",
+                    "user": {
+                        "__typename": "User",
+                        "id": "MDQ6VXNlcjE0MDAwMjM=",
+                        "login": "decentralion",
+                        "url": "https://github.com/decentralion"
+                    }
+                },
+                {
+                    "__typename": "Reaction",
+                    "content": "EYES",
+                    "id": "MDg6UmVhY3Rpb24zNTc5ODQ0Mg==",
+                    "user": {
+                        "__typename": "User",
+                        "id": "MDQ6VXNlcjE0MDAwMjM=",
+                        "login": "decentralion",
+                        "url": "https://github.com/decentralion"
+                    }
                 }
             ],
             "title": "An issue with reactions",