Merge pull request #336 from michael-gutman/master

ADD: negate.md

snippets/negate.md

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+### negate
+
+Negates a predicate function.
+
+Take a predicate function and apply `not` to it with its arguments.
+
+```js
+const negate = func => (...args) => !fun(...args);
+// filter([1, 2, 3, 4, 5, 6], negate(isEven)) -> [1, 3, 5]
+// negate(isOdd)(1) -> false
+```