Create CHANGELOG.md

Author: alesanchezr

CHANGELOG.md

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+# Sep 16
+
+Niza Vera will be adding 13 exercises from [this Mastering Python Lesson in Repl.it](https://repl.it/classroom/invite/avFe7Od)
+
+```bash
+9.1. Sets: Number of distinct
+9.2. Sets: Number of common
+9.3. Sets: Intersection
+9.4. Sets: Seen before
+9.5. Sets: Guess the number
+A.1. Dicts: Number of occurrences
+A.2. Dicts: Synonyms
+A.3. Dicts: Elections
+A.4. Dicts: Most frequent word
+A.5. Dicts: Access rights
+A.6. Dicts: Countries and cities
+A.7. Dicts: Frequency analysis
+A.8. Dicts: English-Latin dictionary
+```