Update README - Topic Tags

Author: hogan-tech

README.md

@@ -122,16 +122,20 @@ Feedback / Questions → open an Issue or reach out on [LinkedIn](https://www.li
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 | [0316-remove-duplicate-letters](https://github.com/hogan-tech/leetcode-solution/tree/master/0316-remove-duplicate-letters) |
+| [1159-smallest-subsequence-of-distinct-characters](https://github.com/hogan-tech/leetcode-solution/tree/master/1159-smallest-subsequence-of-distinct-characters) |
 ## Stack
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 | [0316-remove-duplicate-letters](https://github.com/hogan-tech/leetcode-solution/tree/master/0316-remove-duplicate-letters) |
+| [1159-smallest-subsequence-of-distinct-characters](https://github.com/hogan-tech/leetcode-solution/tree/master/1159-smallest-subsequence-of-distinct-characters) |
 ## Greedy
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 | [0316-remove-duplicate-letters](https://github.com/hogan-tech/leetcode-solution/tree/master/0316-remove-duplicate-letters) |
+| [1159-smallest-subsequence-of-distinct-characters](https://github.com/hogan-tech/leetcode-solution/tree/master/1159-smallest-subsequence-of-distinct-characters) |
 ## Monotonic Stack
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 | ------- |
 | [0316-remove-duplicate-letters](https://github.com/hogan-tech/leetcode-solution/tree/master/0316-remove-duplicate-letters) |
+| [1159-smallest-subsequence-of-distinct-characters](https://github.com/hogan-tech/leetcode-solution/tree/master/1159-smallest-subsequence-of-distinct-characters) |
 <!---LeetCode Topics End-->