Merge pull request #339 from chrisberkhout/fix-readme-re-falsy-values

Fixed README to mention all falsy values tested in test/_files/falsy.*.

README.md

@@ -102,7 +102,7 @@ The behavior of the section is determined by the value of the key.
 
 #### False Values or Empty Lists
 
-If the `person` key does not exist, or exists and has a value of `null`, `undefined`, or `false`, or is an empty list, the block will not be rendered.
+If the `person` key does not exist, or exists and has a value of `null`, `undefined`, `false`, `0`, or `NaN`, or is an empty string or an empty list, the block will not be rendered.
 
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