Update README (#201)

Signed-off-by: Stefan VanBuren <svanburen@buf.build>

Author: stefanvanburen

README.md

@@ -82,9 +82,7 @@ from your_service_connect import HelloServiceClient
 
 # Create async client
 async def main():
-    async with HelloServiceClient(
-        base_url="https://api.example.com",
-    ) as client:
+    async with HelloServiceClient("https://api.example.com") as client:
         # Make a unary RPC call
         response = await client.say_hello(HelloRequest(name="World"))
         print(response.message)  # "Hello, World!"
@@ -116,9 +114,7 @@ from your_service_connect import HelloServiceClientSync
 
 # Create sync client
 def main():
-    with HelloServiceClientSync(
-        base_url="https://api.example.com",
-    ) as client:
+    with HelloServiceClientSync("https://api.example.com") as client:
         # Make a unary RPC call
         response = client.say_hello(HelloRequest(name="World"))
         print(response.message)  # "Hello, World!"
@@ -292,14 +288,20 @@ Compression is automatically negotiated between client and server based on the `
 Interceptors allow you to add cross-cutting concerns like authentication, logging, and metrics:
 
 ```python
-from connectrpc.interceptor import Interceptor
+from connectrpc.interceptor import MetadataInterceptor
+from connectrpc.request import RequestContext
+
+class LoggingInterceptor:
+    """Implements the MetadataInterceptor protocol."""
+
+    async def on_start(self, ctx: RequestContext) -> None:
+        print(f"Handling {ctx.method.name} request")
 
-class LoggingInterceptor(Interceptor):
-    async def intercept(self, method, request, context, next_handler):
-        print(f"Handling {method} request")
-        response = await next_handler(request, context)
-        print(f"Completed {method} request")
-        return response
+    async def on_end(self, token: None, ctx: RequestContext, error: Exception | None) -> None:
+        if error:
+            print(f"Failed {ctx.method.name}: {error}")
+        else:
+            print(f"Completed {ctx.method.name} request")
 
 # Add to your application
 app = HelloServiceASGIApplication(
@@ -314,8 +316,7 @@ Clients also support interceptors for request/response processing:
 
 ```python
 client = HelloServiceClient(
-    base_url="https://api.example.com",
-    session=session,
+    "https://api.example.com",
     interceptors=[AuthInterceptor(), RetryInterceptor()]
 )
 ```
@@ -373,8 +374,7 @@ app = YourServiceASGIApplication(
 
 # Client with message size limit
 client = YourServiceClient(
-    base_url="https://api.example.com",
-    session=session,
+    "https://api.example.com",
     read_max_bytes=1024 * 1024
 )
 ```
@@ -397,7 +397,7 @@ service YourService {
 
 ## Development
 
-We use `ruff` for linting and formatting, and `pyright` for type checking.
+We use `ruff` for linting and formatting, `pyright` for type checking, and `tombi` for TOML linting and formatting.
 
 We rely on the conformance test suit (in
 [./conformance](./conformance)) to verify behavior.