pyproject: bump version to 0.2.0

Now with more features!

 - Nested tag insertion support
   - Automatically reifies entire hierarchies
 - Tag listing support
   - Prints the nested tag structure
 - Data insertion support
   - From standard input or files
   - Efficient SQLite blob handling
   - Hashing support
     - Multithreaded multi-hashing
     - Added to database as tag values
 - General improvements to code, interfaces, queries

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "taggr"
-version = "0.1.0"
+version = "0.2.0"
 authors = [
   { name="Matheus Afonso Martins Moreira", email="[email protected]" },
 ]