Updated README.md to add bar example

Signed-off-by: Andrew Welch <andrew@nystudio107.com>
nystudio107 · Jun 17, 2018 · 9ae9763 · 9ae9763
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diff --git a/README.md b/README.md
@@ -95,6 +95,7 @@ bark
 ```
 
 ...because:
+- `bar` is `null`
 - `woof` is undefined
 - `foo` is an empty string
 - `baz` is an empty array