add a heads up about case sensitivity

Author: Leo Folsom

README.md

@@ -112,13 +112,13 @@ $ data-diff \
 
 | Database      | Connection string                                                                       | Status |
 |---------------|-----------------------------------------------------------------------------------------|--------|
-| PostgreSQL    | `postgresql://<user>:<password>@<hostname>:<5432>/<database>`                           |  💚    |
-| MySQL         | `mysql://<user>:<password>@<hostname>:<5432>/<database>`                                |  💚    |
+| PostgreSQL    | `postgresql://<user>:<password>@<hostname>:5432/<database>`                           |  💚    |
+| MySQL         | `mysql://<user>:<password>@<hostname>:5432/<database>`                                |  💚    |
 | Snowflake     | `"snowflake://<user>:<password>@<account>/<database>/<SCHEMA>?warehouse=<WAREHOUSE>&role=<role>"`|  💚    |
 | Oracle        | `oracle://<username>:<password>@<hostname>/database`                                          |  💛    |
 | BigQuery      | `bigquery://<project>/<dataset>`                                                            |  💛    |
-| Redshift      | `redshift://<username>:<password>@<hostname>:<5439>/<database>`                                   |  💛    |
-| Presto        | `presto://<username>:<password>@<hostname>:<8080>/<database>`                                     |  💛    |
+| Redshift      | `redshift://<username>:<password>@<hostname>:5439/<database>`                                   |  💛    |
+| Presto        | `presto://<username>:<password>@<hostname>:8080/<database>`                                     |  💛    |
 | ElasticSearch |                                                                                         |  📝    |
 | Databricks    |                                                                                         |  📝    |
 | Planetscale   |                                                                                         |  📝    |
@@ -171,7 +171,10 @@ Users can also install several drivers at once:
 Usage: `data-diff DB1_URI TABLE1_NAME DB2_URI TABLE2_NAME [OPTIONS]`
 
 See the [example command](#example-command-and-output) and the [sample
-connection strings](#supported-databases).
+connection strings](#supported-databases). 
+
+Note that for some databases, the arguments that you enter in the command line 
+may be case-sensitive. This is the case for the Snowflake schema and table names.
 
 Options: