Update ESLint rule to require quoting numeric properties.

Flow does not allow unquoted numeric object properties, so ensure ESLint and Flow agree on this.

As originally illustrated in #425

Author: leebyron

.eslintrc

@@ -196,7 +196,7 @@
     "prefer-const": 2,
     "prefer-reflect": 0,
     "prefer-spread": 0,
-    "quote-props": [2, "as-needed"],
+    "quote-props": [2, "as-needed", {"numbers": true}],
     "quotes": [2, "single"],
     "radix": 2,
     "require-yield": 2,

src/__tests__/starWarsData.js

@@ -52,11 +52,11 @@ const tarkin = {
 };
 
 const humanData = {
-  1000: luke,
-  1001: vader,
-  1002: han,
-  1003: leia,
-  1004: tarkin,
+  '1000': luke,
+  '1001': vader,
+  '1002': han,
+  '1003': leia,
+  '1004': tarkin,
 };
 
 const threepio = {
@@ -76,8 +76,8 @@ const artoo = {
 };
 
 const droidData = {
-  2000: threepio,
-  2001: artoo,
+  '2000': threepio,
+  '2001': artoo,
 };
 
 /**