Update history.md

Author: wooorm

history.md

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+*   Add IDL descriptions of abstract definitions ([`913b1bd`](https://github.com/wooorm/unist/commit/913b1bd))
+*   Fix disallowed empty `children` array ([`a6d3a03`](https://github.com/wooorm/unist/commit/a6d3a03))
+*   Add description of `indent` on `node.position` ([`60da1d2`](https://github.com/wooorm/unist/commit/60da1d2))
+*   Remove `attributes` support on nodes ([`3aea64f`](https://github.com/wooorm/unist/commit/3aea64f))
+*   Fix to make `value` / `children` optional ([`b7c4317`](https://github.com/wooorm/unist/commit/b7c4317))