Added pip extras

README.md

@@ -24,11 +24,21 @@ As such, Snowfall returns unique GUIDs for as long as:
 - *Schema group:* A grouping of generators that always produce globally unique IDs.
 
 ### Installation
-A complete installation of Snowfall with all [`generator_syncers`](#enforcing-unique-generator_ids) and their dependencies.
+A minimal installation of Snowfall. This supports both the `SimpleSyncer`, and the `DatabaseSyncer` when used with SQLite.
 ```
 pip install snowfall
 ```
 
+#### DBMS-specific dependencies
+However, because the `DatabaseSyncer` uses SQLAlchemy to connect to the database, there are optional dependencies depending on the DBMS used. For instance, MySQL requires the `MySQL-python` package, while PostgreSQL requires `psycopg2`. More information can be found in the [SQLAlchemy docs](https://docs.sqlalchemy.org/en/latest/core/engines.html).
+
+For convenience, we have included the following pip extras:
+```
+pip install snowfall[postgres]
+pip install snowfall[mysql]
+pip install snowfall[oracle]
+```
+
 ### Quickstart
 To start generating IDs, simply create a schema group and start a `Snowfall`. 
 ```

setup.py

@@ -8,7 +8,7 @@
 
 setup(
     name="snowfall",
-    version="1.0.3",
+    version="1.0.4",
     description="Bigint-based distributed GUID generator",
     long_description=(HERE / "README.md").read_text(),
     long_description_content_type="text/markdown",
@@ -28,4 +28,9 @@
             "create_db_schema_group=src.generator_syncers.database_syncers:create_schema_group",
         ]
     },
-)
+    extras_require={
+        "postgres": ["psycopg2-binary==2.8.5"],
+        "mysql": ["MySQL-python==1.2.5"],
+        "oracle": ["cx-Oracle==8.0.0"]
+    }
+)